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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2012	Feb. 20, 2013	Jun. 30, 2012
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	BRO
Entity Registrant Name	BROWN & BROWN INC
Entity Central Index Key	0000079282
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		143,943,521
Entity Public Float			$ 3,200,673,955

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES
Commissions and fees	$ 1,189,081	$ 1,005,962	$ 966,917
Investment income	797	1,267	1,326
Other income, net	10,154	6,313	5,249
Total revenues	1,200,032	1,013,542	973,492
EXPENSES
Employee compensation and benefits	608,506	508,675	487,820
Non-cash stock-based compensation	15,865	11,194	6,845
Other operating expenses	174,389	144,079	135,851
Amortization	63,573	54,755	51,442
Depreciation	15,373	12,392	12,639
Interest	16,097	14,132	14,471
Change in estimated acquisition earn-out payables	1,418	(2,206)	(1,674)
Total expenses	895,221	743,021	707,394
Income before income taxes	304,811	270,521	266,098
Income taxes	120,766	106,526	104,346
Net income	$ 184,045	$ 163,995	$ 161,752
Net income per share:
Basic	$ 1.28	$ 1.15	$ 1.14
Diluted	$ 1.26	$ 1.13	$ 1.12
Weighted average number of shares outstanding:
Basic	139,364	138,582	137,924
Diluted	142,010	140,264	139,318
Dividends declared per share	$ 0.3450	$ 0.3250	$ 0.3125

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 219,821	$ 286,305
Restricted cash and investments	164,564	130,535
Short-term investments	8,183	7,627
Premiums, commissions and fees receivable	302,725	240,257
Deferred income taxes	24,408	19,863
Other current assets	39,811	23,540
Total current assets	759,512	708,127
Fixed assets, net	74,337	61,360
Goodwill	1,711,514	1,323,469
Amortizable intangible assets, net	566,538	496,182
Other assets	16,157	17,873
Total assets	3,128,058	2,607,011
Current Liabilities:
Premiums payable to insurance companies	406,704	327,096
Premium deposits and credits due customers	32,867	30,048
Accounts payable	48,524	22,384
Accrued expenses and other liabilities	79,593	100,865
Current portion of long-term debt	93	1,227
Total current liabilities	567,781	481,620
Long-term debt	450,000	250,033
Deferred income taxes, net	237,630	178,052
Other liabilities	65,314	53,343
Commitments and contingencies (Note 13)
Shareholders' Equity:
Common stock, par value $0.10 per share; authorized 280,000 shares; issued and outstanding 143,878 at 2012 and 143,352 at 2011	14,388	14,335
Additional paid-in capital	335,872	307,059
Retained earnings	1,457,073	1,322,562
Accumulated other comprehensive income, net of related income tax effect of $0 at 2012 and $4 at 2011		7
Total shareholders' equity	1,807,333	1,643,963
Total liabilities and shareholders' equity	$ 3,128,058	$ 2,607,011

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	280,000	280,000
Common stock, shares issued	143,878	143,352
Common stock, shares outstanding	143,878	143,352
Tax effect of accumulated other comprehensive income	$ 0	$ 4

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2009	$ 1,369,874	$ 14,208	$ 267,856	$ 1,087,805	$ 5
Beginning balance (in shares) at Dec. 31, 2009		142,076
Net income	161,752			161,752
Net unrealized holding gain (loss) on available-for-sale securities	2				2
Comprehensive income	161,754
Common stock issued for employee stock benefit plans (in Shares)		705
Common stock issued for employee stock benefit plans	7,565	$ 70	7,495
Income tax benefit from exercise of stock benefit plans	$ 11,391		$ 11,391
Common stock issued to directors (in shares)		14
Common stock issued to directors	256	1	255
Cash dividends paid	$ (44,496)			(44,496)
Ending balance at Dec. 31, 2010	1,506,344	$ 14,279	$ 286,997	1,205,061	7
Ending balance (in shares) at Dec. 31, 2010		142,795
Net income	163,995			163,995
Common stock issued for employee stock benefit plans (in Shares)		545
Common stock issued for employee stock benefit plans	18,914	$ 55	18,859
Income tax benefit from exercise of stock benefit plans	$ 916		$ 916
Common stock issued to directors (in shares)		12
Common stock issued to directors	288	1	287
Cash dividends paid	$ (46,494)			(46,494)
Ending balance at Dec. 31, 2011	$ 1,643,963	$ 14,335	$ 307,059	1,322,562	7
Ending balance (in shares) at Dec. 31, 2011	143,352	143,352
Net income	$ 184,045			184,045
Net unrealized holding gain (loss) on available-for-sale securities	(7)				$ (7)
Comprehensive income	184,038
Common stock issued for employee stock benefit plans (in Shares)		501
Common stock issued for employee stock benefit plans	19,599	$ 50	19,549
Income tax benefit from exercise of stock benefit plans	$ 8,659		$ 8,659
Common stock issued to directors (in shares)		25
Common stock issued to directors	608	3	605
Cash dividends paid	$ (49,534)			(49,534)
Ending balance at Dec. 31, 2012	$ 1,807,333	$ 14,388	$ 335,872	$ 1,457,073
Ending balance (in shares) at Dec. 31, 2012	143,878	143,878

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash dividends paid, per share	$ 0.3450	$ 0.3250	$ 0.3125

CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 184,045	$ 163,995	$ 161,752
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization	63,573	54,755	51,442
Depreciation	15,373	12,392	12,639
Non-cash stock-based compensation	15,865	11,194	6,845
Change in estimated acquisition earn-out payables	1,418	(2,206)	(1,674)
Deferred income taxes	32,723	30,328	22,587
Income tax benefit from exercise of shares from the stock benefit plans	(8,659)	(916)	(11,391)
Net gain on sales of investments, fixed assets and customer accounts	(4,105)	(1,890)	(1,474)
Payments on acquisition earn-outs in excess of original estimated payables	(4,086)	(1,369)
Changes in operating assets and liabilities, net of effect from acquisitions and divestitures:
Restricted cash and investments (increase) decrease	(34,029)	(6,941)	31,663
Premiums, commissions and fees receivable (increase)	(11,312)	(20,570)	(2,555)
Other assets decrease (increase)	2,145	(7,322)	14,529
Premiums payable to insurance companies (decrease) increase	(4,651)	9,447	436
Premium deposits and credits due customers increase (decrease)	2,506	1,277	(9,673)
Accounts payable increase (decrease)	36,505	(2,807)	28,246
Accrued expenses and other liabilities (decrease) increase	(43,059)	3,975	(2,087)
Other liabilities (decrease)	(23,937)	(5,811)	(5,233)
Net cash provided by operating activities	220,315	237,531	296,052
Cash flows from investing activities:
Additions to fixed assets	(24,028)	(13,608)	(10,454)
Payments for businesses acquired, net of cash acquired	(425,054)	(166,055)	(157,637)
Proceeds from sales of fixed assets and customer accounts	14,095	3,686	1,558
Purchases of investments	(11,167)	(12,698)	(9,285)
Proceeds from sales of investments	10,654	12,950	9,327
Net cash used in investing activities	(435,500)	(175,725)	(166,491)
Cash flows from financing activities:
Payments on acquisition earn-outs	(13,539)	(8,843)	(2,136)
Proceeds from long-term debt	200,000	100,000
Payments on long-term debt	(1,227)	(102,072)	(19,425)
Borrowings on revolving credit facilities	100,000
Payments on revolving credit facilities	(100,000)
Income tax benefit from exercise of shares from the stock benefit plans	8,659	916	11,391
Issuances of common stock for employee stock benefit plans	13,305	8,667	11,119
Repurchase of stock benefit plan shares for employee to fund tax withholdings	(8,963)	(659)	(10,143)
Cash dividends paid	(49,534)	(46,494)	(44,496)
Net cash provided by (used in) financing activities	148,701	(48,485)	(53,690)
Net (decrease) increase in cash and cash equivalents	(66,484)	13,321	75,871
Cash and cash equivalents at beginning of year	286,305	272,984	197,113
Cash and cash equivalents at end of year	$ 219,821	$ 286,305	$ 272,984

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies

NOTE 1 Summary of Significant Accounting Policies

Nature of Operations

Brown & Brown, Inc., a Florida corporation, and its subsidiaries (collectively, “Brown & Brown” or the “Company”) is a diversified insurance agency, wholesale brokerage, insurance programs and services organization that markets and sells to its customers insurance products and services, primarily in the property and casualty area. Brown & Brown’s business is divided into four reportable segments: the Retail Division, which provides a broad range of insurance products and services to commercial, public entity, professional and individual customers; the Wholesale Brokerage Division, which markets and sells excess and surplus commercial insurance and reinsurance, primarily through independent agents and brokers; the National Programs Division, which provides professional liability and related package products for certain professionals delivered through nationwide networks of independent agents, and markets targeted products and services designated for specific industries, trade groups, governmental entities and market niches; and the Services Division, which provides insurance-related services, including third-party claims administration and comprehensive medical utilization management services in both the workers’ compensation and all-lines liability arenas, as well as Medicare set-aside services, Social Security disability and Medicare benefits advocacy services, and catastrophe claims adjusting services.

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of Brown & Brown, Inc. and its subsidiaries. All significant intercompany account balances and transactions have been eliminated in the Consolidated Financial Statements.

Reclassification

Effective January 1, 2012, certain offices were reclassified from the National Programs Division to the Wholesale Brokerage Division, and as such, certain prior-year amounts have been reclassified to conform to the current year presentation.

Revenue Recognition

Commission revenues are recognized as of the effective date of the insurance policy or the date on which the policy premium is billed to the customer, whichever is later. Commission revenues related to installment billings at the Company’s subsidiary, Arrowhead General Insurance Agency, Inc. (“Arrowhead”), are recorded on the later of the effective date of the policy or the first installment billing. At those dates, the earnings process has been completed, and Brown & Brown can reliably estimate the impact of policy cancellations for refunds and establish reserves accordingly. The reserve for policy cancellations is based upon historical cancellation experience adjusted for known circumstances. The policy cancellation reserve was $7,174,000 and $6,396,000 at December 31, 2012 and 2011, respectively, and it is periodically evaluated and adjusted as necessary. Subsequent commission adjustments are recognized upon receipt of notification from the insurance companies. Commission revenues are reported net of commissions paid to sub-brokers or co-brokers. Profit-sharing contingent commissions from insurance companies are recognized when determinable, which is when such commissions, or official notification of the amount of such commissions is received. Fee income is recognized as services are rendered.

Use of Estimates

The preparation of Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, as well as disclosures of contingent assets and liabilities, at the date of the Consolidated Financial Statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates.

Cash and Cash Equivalents

Cash and cash equivalents principally consist of demand deposits with financial institutions and highly liquid investments with quoted market prices having maturities of three months or less when purchased.

Restricted Cash and Investments, and Premiums, Commissions and Fees Receivable

In its capacity as an insurance agent or broker, Brown & Brown typically collects premiums from insureds and, after deducting its authorized commissions, remits the net premiums to the appropriate insurance company or companies. Accordingly, as reported in the Consolidated Balance Sheets, “premiums” are receivable from insureds. Unremitted net insurance premiums are held in a fiduciary capacity until Brown & Brown disburses them. Brown & Brown invests these unremitted funds only in cash, money market accounts, tax-free variable-rate demand bonds and commercial paper held for a short term. In certain states in which Brown & Brown operates, the use and investment alternatives for these funds are regulated and restricted by various state laws and agencies. These restricted funds are reported as restricted cash and investments on the Consolidated Balance Sheets. The interest income earned on these unremitted funds is reported as investment income in the Consolidated Statements of Income.

In other circumstances, the insurance companies collect the premiums directly from the insureds and remit the applicable commissions to Brown & Brown. Accordingly, as reported in the Consolidated Balance Sheets, “commissions” are receivables from insurance companies. “Fees” are primarily receivables due from customers.

Investments

Equity securities held by Brown & Brown have been classified as “available-for-sale” and are reported at estimated fair value, with the accumulated other comprehensive income (unrealized gains and losses), net of related income tax effect, reported as a separate component of shareholders’ equity. Realized gains and losses and declines in value below cost that are judged to be other-than-temporary on available-for-sale securities are reflected in investment income. The cost of securities sold is based on the specific identification method. Interest and dividends on securities classified as available-for-sale are included in investment income in the Consolidated Statements of Income.

Equity securities and certificates of deposit having maturities of more than three months when purchased are reported at cost and are adjusted for other-than-temporary market value declines.

Fixed Assets

Fixed assets, including leasehold improvements, are carried at cost, less accumulated depreciation and amortization. Expenditures for improvements are capitalized, and expenditures for maintenance and repairs are expensed to operations as incurred. Upon sale or retirement, the cost and related accumulated depreciation and amortization are removed from the accounts and the resulting gain or loss, if any, is reflected in other income. Depreciation has been determined using the straight-line method over the estimated useful lives of the related assets, which range from three to 15 years. Leasehold improvements are amortized on the straight-line method over the shorter of the useful life of the improvement or the term of the related lease.

Goodwill and Amortizable Intangible Assets

The excess of the purchase price of an acquisition over the fair value of the identifiable tangible and amortizable intangible assets is assigned to goodwill. While goodwill is not amortizable, it is subject to assessment at least annually, and more frequently in the presence of certain circumstances, for impairment by application of a fair value-based test. The Company compares the fair value of each reporting unit with its carrying amount to determine if there is potential impairment of goodwill. If the fair value of the reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the fair value of the goodwill within the reporting unit is less than its carrying value. Fair value is estimated based on multiples of earnings before interest, income taxes, depreciation, amortization and change in estimated acquisition earn-out payables (“EBITDAC”). Brown & Brown completed its most recent annual assessment as of November 30, 2012 and determined that the fair value of goodwill exceeded the carrying value of such assets. In addition, as of December 31, 2012, there are no accumulated impairment losses.

Amortizable intangible assets are stated at cost, less accumulated amortization, and consist of purchased customer accounts and non-compete agreements. Purchased customer accounts and non-compete agreements are amortized on a straight-line basis over the related estimated lives and contract periods, which range from five to 15 years. Purchased customer accounts primarily consist of records and files that contain information about insurance policies and the related insured parties that are essential to policy renewals.

The carrying value of amortizable intangible assets attributable to each business or asset group comprising Brown & Brown is periodically reviewed by management to determine if there are events or changes in circumstances that would indicate that its carrying amount may not be recoverable. Accordingly, if there are any such changes in circumstances during the year, Brown & Brown assesses the carrying value of its amortizable intangible assets by considering the estimated future undiscounted cash flows generated by the corresponding business or asset group. Any impairment identified through this assessment may require that the carrying value of related amortizable intangible assets be adjusted; however, no impairments were recorded for the years ended December 31, 2012, 2011 and 2010.

Income Taxes

Brown & Brown records income tax expense using the asset-and-liability method of accounting for deferred income taxes. Under this method, deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial statement carrying values and the income tax bases of Brown & Brown’s assets and liabilities.

Brown & Brown files a consolidated federal income tax return and has elected to file consolidated returns in certain states. Deferred income taxes are provided for in the Consolidated Financial Statements and relate principally to expenses charged to income for financial reporting purposes in one period and deducted for income tax purposes in other periods.

Net Income Per Share

Effective in 2009, the Company adopted new Financial Accounting Standards Board (“FASB”) authoritative guidance that states that unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents are participating securities and, therefore, are included in computing earnings per share (“EPS”) pursuant to the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends or dividend equivalents and their respective participation rights in undistributed earnings. Performance stock shares granted to employees under the Company’s Performance Stock Plan and under the Company’s Stock Incentive Plan are considered participating securities as they receive non-forfeitable dividend equivalents at the same rate as common stock.

Basic EPS is computed based on the weighted average number of common shares (including participating securities) issued and outstanding during the period. Diluted EPS is computed based on the weighted average number of common shares issued and outstanding plus equivalent shares, assuming the exercise of stock options. The dilutive effect of stock options is computed by application of the treasury-stock method. For the year ended December 31, 2010, the impact of outstanding options to purchase 12,000 shares of common stock was anti-dilutive; these shares were excluded from the calculation of diluted net income per share. The following is a reconciliation between basic and diluted weighted average shares outstanding for the years ended December 31:


(in thousands, except per share data)	2012			2011			2010
Net income	$	184,045		$	163,995		$	161,752
Net income attributable to unvested awarded performance stock		(5,313	)		(5,099	)		(5,097	)

Net income attributable to common shares	$	178,732		$	158,896		$	156,655

Weighted average basic number of common shares outstanding		143,507			143,029			142,412
Less unvested awarded performance stock included in weighted average basic share outstanding		(4,143	)		(4,447	)		(4,488	)

Weighted average number of common shares outstanding for basic earnings per common share		139,364			138,582			137,924
Dilutive effect of stock options		2,646			1,682			1,394

Weighted average number of shares outstanding		142,010			140,264			139,318

Net income per share:
Basic	$	1.28		$	1.15		$	1.14

Diluted	$	1.26		$	1.13		$	1.12

Fair Value of Financial Instruments

The carrying amounts of Brown & Brown’s financial assets and liabilities, including cash and cash equivalents, restricted cash and investments, investments, premiums, commissions and fees receivable, premiums payable to insurance companies, premium deposits and credits due customers and accounts payable, at December 31, 2012 and 2011, approximate fair value because of the short-term maturity of these instruments. The carrying amount of Brown & Brown’s long-term debt approximates fair value at December 31, 2012 and 2011 because the related coupon rate approximates the current market rate.

Stock-Based Compensation

The Company grants stock options and non-vested stock awards to its employees, officers and directors. The Company uses the modified-prospective method to account for share-based payments. Under the modified-prospective method, compensation cost is recognized for all share-based payments granted on or after January 1, 2006 and for all awards granted to employees prior to January 1, 2006 that remained unvested on that date. The Company uses the alternative-transition method to account for the income tax effects of payments made related to stock-based compensation.

The Company uses the Black-Scholes valuation model for valuing all stock options and shares purchased under the Employee Stock Purchase Plan (the “ESPP”). Compensation for non-vested stock awards is measured at fair value on the grant date based upon the number of shares expected to vest. Compensation cost for all awards is recognized in earnings, net of estimated forfeitures, on a straight-line basis over the requisite service period.

Recent Accounting Pronouncements

Goodwill Impairment — In September 2011, the FASB issued authoritative guidance which simplifies goodwill impairment testing by allowing an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. An entity is no longer required to determine the fair value of a reporting unit unless it is more likely than not that the fair value is less than carrying value. The guidance is effective for interim and annual periods beginning after December 15, 2011. The adoption of this guidance did not have any material impact on the Company’s Consolidated Financial Statements.

Business Combinations

12 Months Ended

Dec. 31, 2012

Business Combinations

NOTE 2 Business Combinations

Acquisitions in 2012

During 2012, Brown & Brown acquired the assets and assumed certain liabilities of 19 insurance intermediaries, all of the stock of one insurance intermediary and a book of business (customer accounts). The aggregate purchase price of these acquisitions was $667,586,000, including $483,933,000 of cash payments, the issuance of notes payable of $59,000, the issuance of $25,439,000 in other payables, the assumption of $136,676,000 of liabilities and $21,479,000 of recorded earn-out payables. The ‘other payables’ amount includes $22,061,000 that the Company is obligated to pay all shareholders of Arrowhead on a pro rata basis for certain pre-merger corporate tax refunds and certain estimated potential future income tax credits that were created by net operating loss carryforwards originating from transaction-related tax benefit items. All of these acquisitions were acquired primarily to expand Brown & Brown’s core businesses and to attract high-quality personnel. Acquisition purchase prices are typically based on a multiple of average annual operating profit earned over a one—to three-year period within a minimum and maximum price range. The recorded purchase price for all acquisitions consummated after January 1, 2009 included an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations will be recorded in the consolidated statement of income when incurred.

The fair value of earn-out obligations is based on the present value of the expected future payments to be made to the sellers of the acquired businesses in accordance with the provisions outlined in the respective purchase agreements. In determining fair value, the acquired business’s future performance is estimated using financial projections developed by management for the acquired business and reflects market participant assumptions regarding revenue growth and/or profitability. The expected future payments are estimated on the basis of the earn-out formula and performance targets specified in each purchase agreement compared to the associated financial projections. These payments are then discounted to present value using a risk-adjusted rate that takes into consideration the likelihood that the forecasted earn-out payments will be made.

Based on the acquisition date and the complexity of the underlying valuation work, certain amounts included in the Company’s Condensed Consolidated Financial Statements may be provisional and thus subject to further adjustments within the permitted measurement period, as defined in Accounting Standards Codification (“ASC”) Topic 805—Business Combinations. However, the Company does not expect any adjustments to such allocations to be material to the Company’s Condensed Consolidated Financial Statements. The acquisitions made in 2012 have been accounted for as business combinations and are as follows:

(in thousands)


Name	Business Segment		2012 Date of Acquisition		Cash Paid		Note Payable		Other Payable		Recorded Earn-out Payable		Net Assets Acquired		Maximum Potential Earn-out Payable
Arrowhead General Insurance Agency Superholding Corporation		National Programs; Services		January 9	$	396,952	$	—	$	22,061	$	3,290	$	422,303	$	5,000
Insurcorp & GGM Investments LLC (d/b/a Maalouf Benefit Resources)		Retail		May 1		15,500		—		900		4,944		21,344		17,000
Richard W. Endlar Insurance Agency, Inc.		Retail		May 1		10,825		—		—		2,598		13,423		5,500
Texas Security General Insurance Agency, Inc.		Wholesale Brokerage		September 1		14,506		—		2,182		2,124		18,812		7,200
Behnke & Associates, Inc.		Retail		December 1		9,213		—		—		1,126		10,339		3,321
Rowlands & Barranca Agency, Inc		Retail		December 1		8,745		—		—		2,401		11,146		4,000
Other		Various		Various		28,192		59		296		4,996		33,543		14,149

Total					$	483,933	$	59	$	25,439	$	21,479	$	530,910	$	56,170

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition:


(in thousands)	Arrowhead			Insurcorp			Endlar			Texas Security			Behnke		Rowlands			Other			Total
Cash	$	61,786		$	—		$	—		$	—		$	—	$	—		$	—		$	61,786
Other current assets		69,051			180			305			1,866			—		—			422			71,824
Fixed assets		4,629			25			25			45			25		30			158			4,937
Goodwill		321,128			14,745			8,044			10,845			6,430		8,363			21,085			390,640
Purchased customer accounts		99,675			6,490			5,230			6,229			3,843		3,367			13,112			137,946
Non-compete agreements		100			22			11			14			41		21			243			452
Other assets		1			—			—			—			—		—			—			1

Total assets acquired		556,370			21,462			13,615			18,999			10,339		11,781			35,020			667,586
Other current liabilities		(107,579	)		(118	)		(192	)		(187	)		—		(635	)		(1,477	)		(110,188	)
Deferred income taxes, net		(26,488	)		—			—			—			—		—			—			(26,488	)

Total liabilities assumed		(134,067	)		(118	)		(192	)		(187	)		—		(635	)		(1,477	)		(136,676	)

Net assets acquired	$	422,303		$	21,344		$	13,423		$	18,812		$	10,339	$	11,146		$	33,543		$	530,910

The weighted average useful lives for the acquired amortizable intangible assets are as follows: purchased customer accounts, 15.0 years; and non-compete agreements, 5.0 years.

Goodwill of $390,640,000, was allocated to the Retail, National Programs, Wholesale Brokerage and Services Divisions in the amounts of $57,856,000, $289,378,000, $11,656,000 and $31,750,000, respectively. Of the total goodwill of $390,640,000, $52,730,000 is currently deductible for income tax purposes and $316,431,000 is non-deductible. The remaining $21,479,000 relates to the recorded earn-out payables and will not be deductible until it is earned and paid.

The results of operations for the acquisitions completed during 2012 have been combined with those of the Company since their respective acquisition dates. The total revenues and income before income taxes from the acquisitions completed through December 31, 2012, included in the Condensed Consolidated Statement of Income for the twelve months ended December 31, 2012, were $129,472,000 and $898,000, respectively. If the acquisitions had occurred as of the beginning of the period, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.


(UNAUDITED)	For the Year Ended December 31,
(in thousands, except per share data)	2012		2011
Total revenues	$	1,230,408	$	1,163,341
Income before income taxes	$	315,051	$	313,706
Net income	$	190,228	$	190,174
Net income per share:
Basic	$	1.33	$	1.33
Diluted	$	1.30	$	1.31
Weighted average number of shares outstanding:
Basic		139,364		138,582
Diluted		142,010		140,264

Acquisitions in 2011

During 2011, Brown & Brown acquired the assets and assumed certain liabilities of 37 insurance intermediaries, all of the stock of one insurance intermediary and several books of business (customer accounts). The aggregate purchase price of these acquisitions was $214,822,000, including $167,444,000 of cash payments, the issuance of $1,194,000 in notes payable, the assumption of $15,659,000 of liabilities and $30,525,000 of recorded earn-out payables. All of these acquisitions were acquired primarily to expand Brown & Brown’s core businesses and to attract high-quality personnel. Acquisition purchase prices are typically based on a multiple of average annual operating profit earned over a one-to three-year period within a minimum and maximum price range. The recorded purchase price for all acquisitions consummated after January 1, 2009 included an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations will be recorded in the consolidated statement of income when incurred.

The acquisitions made in 2011 have been accounted for as business combinations and are as follows:

(in thousands)


Name	Business Segment		2011 Date of Acquisition		Cash Paid		Note Payable		Recorded Earn-out Payable		Net Assets Acquired		Maximum Potential Earn-out Payable
Balcos Insurance, Inc.		Retail		January 1	$	8,611	$	—	$	1,595	$	10,206	$	5,766
Associated Insurance Service, Inc. et al.		Retail		January 1		12,000		—		1,575		13,575		6,000
United Benefit Services Insurance Agency LLC et al.		Retail		February 1		14,283		—		2,590		16,873		8,442
First Horizon Insurance Group, Inc. et al.		Retail		April 30		25,060		—		—		25,060		—
Fitzharris Agency, Inc. et al.		Retail		May 1		6,159		—		888		7,047		3,832
Corporate Benefit Consultants, LLC		Retail		June 1		9,000		—		2,038		11,038		4,520
Sitzmann, Morris & Lavis Insurance Agency, Inc. et al.		Retail		November 1		40,460		—		6,228		46,688		19,000
Snapper Shuler Kenner, Inc. et al.		Retail		November 1		7,493		—		1,318		8,811		3,988
Industry Consulting Group, Inc.		National Programs		November 1		9,133		—		3,877		13,010		5,794
Colonial Claims Corporation et al.		Services		December 23		9,950		—		4,248		14,198		8,000
Other		Various		Various		25,295		1,194		6,168		32,657		12,865

Total					$	167,444	$	1,194	$	30,525	$	199,163	$	78,207

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition:


*(in thousands)*	Balcos			AIS			United			FHI			FA			CBC
Cash	$	—		$	—		$	—		$	5,170		$	—		$	—
Other current assets		187			252			438			1,640			77			227
Fixed assets		20			100			20			134			60			6
Goodwill		6,486			9,055			10,049			15,254			7,244			6,738
Purchased customer accounts		3,530			4,086			7,045			8,088			3,351			4,046
Non-compete agreements		42			92			45			10			21			21
Other assets		—			—			4			9			—			—

Total assets acquired		10,265			13,585			17,601			30,305			10,753			11,038

Other current liabilities		(59	)		(10	)		(728	)		(3,790	)		(3,706	)		—
Deferred income taxes, net		—			—			—			(1,455	)		—			—
Other liabilities		—			—			—			—			—			—

Total liabilities assumed		(59	)		(10	)		(728	)		(5,245	)		(3,706	)		—

Net assets acquired	$	10,206		$	13,575		$	16,873		$	25,060		$	7,047		$	11,038


*(in thousands)*	SML			SSK			ICG			CC			Other			Total
Cash	$	—		$	—		$	—		$	—		$	—		$	5,170
Other current assets		1,372			247			336			—			1,059			5,835
Fixed assets		465			45			100			60			65			1,075
Goodwill		31,601			5,818			9,564			8,070			18,465			128,344
Purchased customer accounts		13,995			2,726			7,161			6,094			13,746			73,868
Non-compete agreements		42			12			11			23			187			506
Other assets		4			—			5			—			2			24

Total assets acquired		47,479			8,848			17,177			14,247			33,524			214,822

Other current liabilities		(791	)		(37	)		(1,096	)		(49	)		(867	)		(11,133	)
Deferred income taxes, net		—			—			—			—			—			(1,455	)
Other liabilities		—			—			(3,071	)		—			—			(3,071	)

Total liabilities assumed		(791	)		(37	)		(4,167	)		(49	)		(867	)		(15,659	)

Net assets acquired	$	46,688		$	8,811		$	13,010		$	14,198		$	32,657		$	199,163

The weighted average useful lives for the above acquired amortizable intangible assets are as follows: purchased customer accounts, 15.0 years; noncompete agreements, 5.0 years.

Goodwill of $128,344,000, was assigned to the Retail, National Programs and Services Divisions in the amounts of $108,420,000, $11,853,000 and $8,071,000, respectively. Of the total goodwill of $128,344,000, $84,105,000 is currently deductible for income tax purposes and $13,714,000 is non-deductible. The remaining $30,525,000 relates to the recorded acquisition earn-out payables and will not be deductible until it is earned and paid.

The results of operations for the acquisitions completed during 2011 have been combined with those of the Company since their respective acquisition dates. The total revenues and income before income taxes from the acquisitions completed through December 31, 2011 included in the Condensed Consolidated Statement of Income for the twelve months ended December 31, 2011 were $40,291,000 and $7,223,000, respectively. If the acquisitions had occurred as of the beginning of the comparable prior annual reporting period, the Company’s estimated results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.


(UNAUDITED)	For the Year Ended December 31,
*(in thousands, except per share data)*	2011		2010
Total revenues	$	1,058,142	$	1,059,857
Income before income taxes	$	283,404	$	291,944
Net income	$	171,805	$	177,464
Net income per share:
Basic	$	1.20	$	1.25
Diluted	$	1.19	$	1.23
Weighted average number of shares outstanding:
Basic		138,582		137,924
Diluted		140,264		139,318

Acquisitions in 2010

During 2010, Brown & Brown acquired the assets and assumed certain liabilities of 33 insurance intermediaries and several books of business (customer accounts). The aggregate purchase price of these acquisitions was $186,783,000, including $158,636,000 of cash payments, the issuance of $759,000 in notes payable, the assumption of $2,298,000 of liabilities and $25,090,000 of recorded earn-out payables. All of these acquisitions were acquired primarily to expand Brown & Brown’s core businesses and to attract and hire high-quality personnel. Acquisition purchase prices are typically based on a multiple of average annual operating profit earned over a one- to three-year period within a minimum and maximum price range. The recorded purchase price for all acquisitions consummated after January 1, 2009 included an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in the fair value of earn-out obligations will be recorded in the consolidated statement of income when incurred.

These acquisitions have been accounted for as business combinations and are as follows:

(in thousands)


Name	Business Segment		2010 Date of Acquisition		Cash Paid		Note Payable		Recorded Earn-out Payable		Net Assets Acquired		Maximum Potential Earn-out Payable
DiMartino Associates, Inc.		Retail		March 1	$	7,047	$	—	$	3,402	$	10,449	$	5,637
Stone Insurance Agencies, et al.		Retail		May 1		15,825		—		124		15,949		3,000
Crowe Paradis Holding Company, et al.		Services		September 1		75,000		—		8,665		83,665		15,000
Thomas R Jones, Inc.		Retail		October 1		14,634		—		—		14,634		—
Other		Various		Various		46,130		759		12,899		59,788		30,668

Total					$	158,636	$	759	$	25,090	$	184,485	$	54,305

The following table summarizes the estimated fair values of the aggregate assets and liabilities acquired as of the date of each acquisition:

(in thousands)	DiMartino		Stone			Crowe		TR Jones			Other			Total
Cash	$	—	$	—		$	1,000	$	—		$	—		$	1,000
Other current assets		137		516			118		259			1,528			2,558
Fixed assets		21		70			500		120			180			891
Goodwill		6,890		11,128			53,573		8,683			36,119			116,393
Purchased customer accounts		3,380		5,172			28,440		5,643			22,841			65,476
Non-compete agreements		21		74			33		—			332			460
Other assets		—		—			1		4			—			5

Total assets acquired		10,449		16,960			83,665		14,709			61,000			186,783

Other current liabilities		—		(1,011	)		—		(75	)		(1,212	)		(2,298	)

Total liabilities assumed		—		(1,011	)		—		(75	)		(1,212	)		(2,298	)

Net assets acquired	$	10,449	$	15,949		$	83,665	$	14,634		$	59,788		$	184,485

The weighted average useful lives for the above acquired amortizable intangible assets are as follows: purchased customer accounts are 15.0 years, and noncompete agreements are 5.0 years.

Goodwill of $116,393,000, was assigned to the Retail and Services Divisions in the amounts of $57,423,000 and $58,970,000, respectively. Of the total goodwill of $116,393,000, $91,303,000 is currently deductible for income tax purposes. The remaining $25,090,000 relates to the earn-out payables and will not be deductible until it is earned and paid.

The results of operations for the acquisitions completed during 2010 have been combined with those of the Company since their respective acquisition dates. The total revenues and income before income taxes from the acquisitions completed through December 31, 2010 included in the Consolidated Statement of Income for the twelve months ended December 31, 2010 were $30,172,000 and $3,255,000, respectively. If the acquisitions had occurred as of the beginning of the comparable prior annual reporting period, the Company’s results of operations would be as shown in the following table. These unaudited pro forma results are not necessarily indicative of the actual results of operations that would have occurred had the acquisitions actually been made at the beginning of the respective periods.

(UNAUDITED)	For the Year Ended December 31,
*(in thousands, except per share data)*	2010		2009
Total revenues	$	1,015,043	$	1,035,286
Income before income taxes	$	278,635	$	274,908
Net income	$	169,373	$	165,420
Net income per share:
Basic	$	1.19	$	1.17
Diluted	$	1.18	$	1.16
Weighted average number of shares outstanding:
Basic		137,924		137,173
Diluted		139,318		137,507

For acquisitions consummated prior to January 1, 2009, additional consideration paid to sellers as a result of purchase price “earn-out” provisions are recorded as adjustments to intangible assets when the contingencies are settled. The net additional consideration paid by the Company in 2012 as a result of these adjustments totaled $2,907,000, all of which was allocated to goodwill. Of the $2,907,000 net additional consideration paid, $2,907,000 was paid in cash. The net additional consideration paid by the Company in 2011 as a result of these adjustments totaled $4,190,000, all of which was allocated to goodwill. Of the $4,190,000 net additional consideration paid, $3,781,000 was paid in cash and $409,000 was issued as a note payable. The net additional consideration paid by the Company in 2010 as a result of these adjustments totaled $4,037,000, all of which was allocated to goodwill. Of the $4,037,000 net additional consideration paid, $975,000 was paid in cash and $3,062,000 was issued in notes payable.

As of December 31, 2012, the maximum future contingency payments related to all acquisitions totaled $146,858,000, of which all of the $146,858,000 relates to acquisitions consummated subsequent to January 1, 2009.

ASC Topic 805 — Business Combinations is the authoritative guidance requiring an acquirer to recognize 100% of the fair values of acquired assets, including goodwill, and assumed liabilities (with only limited exceptions) upon initially obtaining control of an acquired entity. Additionally, the fair value of contingent consideration arrangements (such as earn-out purchase arrangements) at the acquisition date must be included in the purchase price consideration. As a result, the recorded purchase prices for all acquisitions consummated after January 1, 2009 include an estimation of the fair value of liabilities associated with any potential earn-out provisions. Subsequent changes in these earn-out obligations will be recorded in the consolidated statement of income when incurred. Potential earn-out obligations are typically based upon future earnings of the acquired entities, usually between one and three years.

As of December 31, 2012, the fair values of the estimated acquisition earn-out payables were re-evaluated and measured at fair value on a recurring basis using unobservable inputs (Level 3). The resulting additions, payments, and net changes, as well as the interest expense accretion on the estimated acquisition earn-out payables, for the years ended December 31, were as follows:


	For the Year Ended December 31,
(in thousands)	2012			2011			2010
Balance as of the beginning of the period	$	47,715		$	29,608		$	7,354
Additions to estimated acquisition earn-out payables		21,479			30,525			25,090
Payments for estimated acquisition earn-out payables		(17,625	)		(10,212	)		(1,162	)

Subtotal		51,569			49,921			31,282
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables		(1,051	)		(4,043	)		(2,606	)
Interest expense accretion		2,469			1,837			932

Net change in earnings from estimated acquisition earn-out payables		1,418			(2,206	)		(1,674	)

Balance as of December 31	$	52,987		$	47,715		$	29,608

Of the $52,987,000 in estimated acquisition earn-out payables as of December 31, 2012, $10,164,000 was recorded as accounts payable and $42,823,000 was recorded as other non-current liabilities. Of the $47,715,000 in estimated acquisition earn-out payables as of December 31, 2011, $3,654,000 was recorded as accounts payable and $44,061,000 was recorded as other non-current liabilities.

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 USD ($) Segment	Dec. 31, 2011 USD ($)	Dec. 31, 2010 shares
Accounting Policies [Line Items]
Number of reportable segments	4
Number of units	2
Reserve for policy cancellations \| $	$ 7,174,000	$ 6,396,000
Outstanding options to purchase shares of common stock \| shares			12,000
Non-compete agreements
Accounting Policies [Line Items]
Estimated lives of amortizable intangible assets	7 years 2 months 12 days	7 years 2 months 12 days
Minimum
Accounting Policies [Line Items]
Estimated useful lives of the related assets	3 years
Minimum \| Non-compete agreements
Accounting Policies [Line Items]
Estimated lives of amortizable intangible assets	5 years
Maximum
Accounting Policies [Line Items]
Estimated useful lives of the related assets	15 years
Maximum \| Non-compete agreements
Accounting Policies [Line Items]
Estimated lives of amortizable intangible assets	15 years

Reconciliation Between Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation Of Earning Per Share Statement [Line Items]
Net income	$ 42,637	$ 49,504	$ 42,471	$ 49,433	$ 36,494	$ 44,173	$ 37,035	$ 46,293	$ 184,045	$ 163,995	$ 161,752
Net income attributable to unvested awarded performance stock									(5,313)	(5,099)	(5,097)
Net income attributable to common shares									$ 178,732	$ 158,896	$ 156,655
Weighted average basic number of common shares outstanding									143,507	143,029	142,412
Less unvested awarded performance stock included in weighted average basic share outstanding									(4,143)	(4,447)	(4,488)
Weighted average number of common shares outstanding for basic earnings per common share									139,364	138,582	137,924
Dilutive effect of stock options									2,646	1,682	1,394
Weighted average number of shares outstanding									142,010	140,264	139,318
Basic	$ 0.30	$ 0.34	$ 0.30	$ 0.34	$ 0.25	$ 0.31	$ 0.26	$ 0.32	$ 1.28	$ 1.15	$ 1.14
Diluted	$ 0.29	$ 0.34	$ 0.29	$ 0.34	$ 0.25	$ 0.30	$ 0.26	$ 0.32	$ 1.26	$ 1.13	$ 1.12

Business Combinations - Additional Information (Detail)	12 Months Ended
Business Combinations - Additional Information (Detail)	Dec. 31, 2012 USD ($) yr Entity	Dec. 31, 2011 USD ($) Entity yr	Dec. 30, 2011 USD ($)	Dec. 31, 2010 USD ($) Entity yr
Business Acquisition [Line Items]
Aggregate purchase price of acquisitions	$ 667,586,000	$ 214,822,000		$ 186,783,000
Cash payments for acquisitions	483,933,000	167,444,000		158,636,000
Net additional consideration paid as note payable	59,000	1,194,000		759,000
Other Payable	25,439,000
Assumption of liabilities	136,676,000	15,659,000		2,298,000
Recorded earn-out payable	$ 21,479,000	$ 30,525,000		$ 25,090,000
Average annual operating profit earned period, minimum (years) \| yr	1	1		1
Average annual operating profit earned period, maximum (years) \| yr	3	3		3
Number of acquisitions \| Entity				33
Total goodwill	$ 390,640,000	$ 128,344,000		$ 116,393,000
Goodwill currently deductible for income tax purposes	52,730,000	84,105,000		91,303,000
Goodwill currently non-deductible for income tax purposes	316,431,000	13,714,000
Goodwill related to the recorded earn-out payables	21,479,000	30,525,000		25,090,000
Total revenues related to acquisitions	129,472,000		$ 40,291,000	30,172,000
Income before income taxes related to acquisitions	898,000		$ 7,223,000	$ 3,255,000
Maximum future contingency payments related to acquisitions	$ 146,858,000
Percentage recognition by acquirer of fair value of acquired assets	100.00%
Estimated acquisition earn-out payables	$ 52,987,000	47,715,000
Other Non-Current Liability
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	42,823,000	44,061,000
Accounts Payable
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	10,164,000	$ 3,654,000
Purchased customer accounts
Business Acquisition [Line Items]
Weighted average life (years)				15 years
Non-compete agreements
Business Acquisition [Line Items]
Weighted average life (years)				5 years
Arrowhead General Insurance Agency Superholding Corporation
Business Acquisition [Line Items]
Other Payable	$ 22,061,000
Purchased customer accounts
Business Acquisition [Line Items]
Weighted average life (years)	15 years	15 years
Non-compete agreements
Business Acquisition [Line Items]
Weighted average life (years)	5 years	5 years
Retail
Business Acquisition [Line Items]
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount	$ 57,856,000	$ 108,420,000		$ 57,423,000
National Programs Divisions
Business Acquisition [Line Items]
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount	289,378,000	11,853,000
Wholesale Brokerage Divisions
Business Acquisition [Line Items]
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount	11,656,000
Services
Business Acquisition [Line Items]
Business acquisitions during period purchase price allocation goodwill expected tax deductible amount	31,750,000	8,071,000		58,970,000
Subsequent to January 1, 2009
Business Acquisition [Line Items]
Maximum future contingency payments related to acquisitions	$ 146,858,000
Future earnings of acquired entities, term basis of potential earn-out obligations, minimum (years) \| yr	1
Future earnings of acquired entities, term basis of potential earn-out obligations, maximum (years) \| yr	3
Prior to January 1, 2009
Business Acquisition [Line Items]
Cash payments for acquisitions	$ 2,907,000	3,781,000		975,000
Net additional consideration paid as note payable		409,000		3,062,000
Additional net consideration paid allocated to goodwill	$ 2,907,000	$ 4,190,000		$ 4,037,000
Asset Acquisitions
Business Acquisition [Line Items]
Number of acquisitions \| Entity	19	37
Stock Acquisitions
Business Acquisition [Line Items]
Number of acquisitions \| Entity	1	1

Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	$ 61,786	$ 5,170	$ 1,000
Other current assets	71,824	5,835	2,558
Fixed assets	4,937	1,075	891
Goodwill	390,640	128,344	116,393
Purchased customer accounts	137,946	73,868	65,476
Non-compete agreements	452	506	460
Other assets	1	24	5
Total assets acquired	667,586	214,822	186,783
Other current liabilities	(110,188)	(11,133)	(2,298)
Deferred income taxes, net	(26,488)	(1,455)
Other liabilities		(3,071)
Total liabilities assumed	(136,676)	(15,659)	(2,298)
Net assets acquired	530,910	199,163	184,485
Arrowhead General Insurance Agency Superholding Corporation
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash	61,786
Other current assets	69,051
Fixed assets	4,629
Goodwill	321,128
Purchased customer accounts	99,675
Non-compete agreements	100
Other assets	1
Total assets acquired	556,370
Other current liabilities	(107,579)
Deferred income taxes, net	(26,488)
Total liabilities assumed	(134,067)
Net assets acquired	422,303
Insurcorp & GGM Investments LLC
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	180
Fixed assets	25
Goodwill	14,745
Purchased customer accounts	6,490
Non-compete agreements	22
Total assets acquired	21,462
Other current liabilities	(118)
Total liabilities assumed	(118)
Net assets acquired	21,344
Richard W. Endlar Insurance Agency, Inc.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	305
Fixed assets	25
Goodwill	8,044
Purchased customer accounts	5,230
Non-compete agreements	11
Total assets acquired	13,615
Other current liabilities	(192)
Total liabilities assumed	(192)
Net assets acquired	13,423
Texas Security General Insurance Agency Inc.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	1,866
Fixed assets	45
Goodwill	10,845
Purchased customer accounts	6,229
Non-compete agreements	14
Total assets acquired	18,999
Other current liabilities	(187)
Total liabilities assumed	(187)
Net assets acquired	18,812
Behnke & Associates, Inc.
Fair Value Of Assets And Liabilities Statement [Line Items]
Fixed assets	25
Goodwill	6,430
Purchased customer accounts	3,843
Non-compete agreements	41
Total assets acquired	10,339
Net assets acquired	10,339
Rowlands & Barranca Agency Inc.
Fair Value Of Assets And Liabilities Statement [Line Items]
Fixed assets	30
Goodwill	8,363
Purchased customer accounts	3,367
Non-compete agreements	21
Total assets acquired	11,781
Other current liabilities	(635)
Total liabilities assumed	(635)
Net assets acquired	11,146
Other Acquisitions
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets	422	1,059	1,528
Fixed assets	158	65	180
Goodwill	21,085	18,465	36,119
Purchased customer accounts	13,112	13,746	22,841
Non-compete agreements	243	187	332
Other assets		2
Total assets acquired	35,020	33,524	61,000
Other current liabilities	(1,477)	(867)	(1,212)
Total liabilities assumed	(1,477)	(867)	(1,212)
Net assets acquired	$ 33,543	32,657	59,788
Balcos Insurance, Inc., Et Al
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		187
Fixed assets		20
Goodwill		6,486
Purchased customer accounts		3,530
Non-compete agreements		42
Total assets acquired		10,265
Other current liabilities		(59)
Total liabilities assumed		(59)
Net assets acquired		10,206
Associated Insurance Service, Inc., Et Al
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		252
Fixed assets		100
Goodwill		9,055
Purchased customer accounts		4,086
Non-compete agreements		92
Total assets acquired		13,585
Other current liabilities		(10)
Total liabilities assumed		(10)
Net assets acquired		13,575
United Benefit Services Insurance Agency, Et Al
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		438
Fixed assets		20
Goodwill		10,049
Purchased customer accounts		7,045
Non-compete agreements		45
Other assets		4
Total assets acquired		17,601
Other current liabilities		(728)
Total liabilities assumed		(728)
Net assets acquired		16,873
First Horizon Insurance Group, Inc. et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash		5,170
Other current assets		1,640
Fixed assets		134
Goodwill		15,254
Purchased customer accounts		8,088
Non-compete agreements		10
Other assets		9
Total assets acquired		30,305
Other current liabilities		(3,790)
Deferred income taxes, net		(1,455)
Total liabilities assumed		(5,245)
Net assets acquired		25,060
Fitzharris Agency, Inc. et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		77
Fixed assets		60
Goodwill		7,244
Purchased customer accounts		3,351
Non-compete agreements		21
Total assets acquired		10,753
Other current liabilities		(3,706)
Total liabilities assumed		(3,706)
Net assets acquired		7,047
Corporate Benefit Consultants, LLC
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		227
Fixed assets		6
Goodwill		6,738
Purchased customer accounts		4,046
Non-compete agreements		21
Total assets acquired		11,038
Net assets acquired		11,038
Sitzmann, Morris & Lavis Insurance Agency, Inc. et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		1,372
Fixed assets		465
Goodwill		31,601
Purchased customer accounts		13,995
Non-compete agreements		42
Other assets		4
Total assets acquired		47,479
Other current liabilities		(791)
Total liabilities assumed		(791)
Net assets acquired		46,688
Snapper Shuler Kenner, Inc. et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		247
Fixed assets		45
Goodwill		5,818
Purchased customer accounts		2,726
Non-compete agreements		12
Total assets acquired		8,848
Other current liabilities		(37)
Total liabilities assumed		(37)
Net assets acquired		8,811
Industry Consulting Group, Inc.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets		336
Fixed assets		100
Goodwill		9,564
Purchased customer accounts		7,161
Non-compete agreements		11
Other assets		5
Total assets acquired		17,177
Other current liabilities		(1,096)
Other liabilities		(3,071)
Total liabilities assumed		(4,167)
Net assets acquired		13,010
Colonial Claims Corporation et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Fixed assets		60
Goodwill		8,070
Purchased customer accounts		6,094
Non-compete agreements		23
Total assets acquired		14,247
Other current liabilities		(49)
Total liabilities assumed		(49)
Net assets acquired		$ 14,198
DiMartino Associates,Inc
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets			137
Fixed assets			21
Goodwill			6,890
Purchased customer accounts			3,380
Non-compete agreements			21
Total assets acquired			10,449
Net assets acquired			10,449
Stone Insurance Agencies, et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets			516
Fixed assets			70
Goodwill			11,128
Purchased customer accounts			5,172
Non-compete agreements			74
Total assets acquired			16,960
Other current liabilities			(1,011)
Total liabilities assumed			(1,011)
Net assets acquired			15,949
Crowe Paradis Holding Company,et al.
Fair Value Of Assets And Liabilities Statement [Line Items]
Cash			1,000
Other current assets			118
Fixed assets			500
Goodwill			53,573
Purchased customer accounts			28,440
Non-compete agreements			33
Other assets			1
Total assets acquired			83,665
Net assets acquired			83,665
Thomas R Jones, Inc
Fair Value Of Assets And Liabilities Statement [Line Items]
Other current assets			259
Fixed assets			120
Goodwill			8,683
Purchased customer accounts			5,643
Other assets			4
Total assets acquired			14,709
Other current liabilities			(75)
Total liabilities assumed			(75)
Net assets acquired			$ 14,634

Changes in Carrying Value of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Beginning balance	$ 1,323,469	$ 1,194,827
Goodwill of acquired businesses	393,547	132,534
Goodwill disposed of relating to sales of businesses	(5,502)	(3,892)
Ending balance	1,711,514	1,323,469
Retail
Goodwill [Line Items]
Beginning balance	823,573	716,626
Goodwill of acquired businesses	58,148	112,610
Goodwill transferred		(1,771)
Goodwill disposed of relating to sales of businesses	(5,502)	(3,892)
Ending balance	876,219	823,573
National Programs
Goodwill [Line Items]
Beginning balance	149,802	140,238
Goodwill of acquired businesses	289,378	9,564
Ending balance	439,180	149,802
Wholesale Brokerage
Goodwill [Line Items]
Beginning balance	273,783	269,723
Goodwill of acquired businesses	14,271	2,289
Goodwill transferred		1,771
Ending balance	288,054	273,783
Services
Goodwill [Line Items]
Beginning balance	76,311	68,240
Goodwill of acquired businesses	31,750	8,071
Ending balance	$ 108,061	$ 76,311

Amortizable Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,030,351	$ 901,843
Accumulated Amortization	(463,813)	(405,661)
Net Carrying Value	566,538	496,182
Purchased customer accounts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,005,031	876,552
Accumulated Amortization	(439,623)	(381,615)
Net Carrying Value	$ 565,408	$ 494,937
Weighted Average Life (years)	14 years 10 months 24 days	14 years 10 months 24 days
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 25,320	$ 25,291
Accumulated Amortization	(24,190)	(24,046)
Net Carrying Value	$ 1,130	$ 1,245
Weighted Average Life (years)	7 years 2 months 12 days	7 years 2 months 12 days

Investments, Classified as Level One Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Investment Securities [Line Items]
Available-for-sale equity securities, Current		$ 36
Certificates of deposit and other securities, Current	$ 8,183	7,591
Total investments, Current	8,183	7,627
Available-for-sale equity securities, Non-Current
Certificates of deposit and other securities, Non-Current	16	516
Total investments, Non-Current	$ 16	$ 516

Summary of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 25
Gross Unrealized Gains		11
Gross realized Losses
Estimated Fair Value		$ 36

Fixed Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Furniture, fixtures and equipment	$ 141,844	$ 131,436
Leasehold improvements	18,889	17,045
Land, buildings and improvements	3,902	438
Total cost	164,635	148,919
Less accumulated depreciation and amortization	(90,298)	(87,559)
Total	$ 74,337	$ 61,360

Accrued Expenses and Other Liabilities (Detail) - USD ($)	Dec. 31, 2012	Dec. 31, 2011
Accrued Expenses And Other Liabilities [Line Items]
Accrued compensation and benefits	$ 19,943,000	$ 16,818,000
Accrued rent and vendor expenses	16,972,000	11,554,000
Accrued bonuses	12,668,000	47,585,000
Reserve for policy cancellations	7,174,000	6,396,000
Accrued interest	3,295,000	3,288,000
Other	19,541,000	15,224,000
Total	$ 79,593,000	$ 100,865,000

Long-Term Debt Instrument (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Unsecured Senior Notes	$ 450,000	$ 250,000
Acquisition notes payable	93	1,260
Revolving credit facility
Total debt	450,093	251,260
Less current portion	(93)	(1,227)
Long-term debt	$ 450,000	$ 250,033

Long-Term Debt - Additional Information (Detail)	1 Months Ended			12 Months Ended
Long-Term Debt - Additional Information (Detail)	Oct. 12, 2012 USD ($) yr	Jan. 09, 2012 USD ($)	Jun. 12, 2008 USD ($)	Dec. 31, 2012 USD ($) yr	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 450,000,000	$ 250,000,000
Revolving credit facility, extended maturity date			Jun. 03, 2013
Interest paid				16,090,000	15,571,000	$ 14,491,000
Maturities of long term debt 2013				93,000
Maturities of long term debt 2014				100,000,000
Maturities of long term debt 2015				25,000,000
Maturities of long term debt 2016				225,000,000
Maturities of long term debt 2017 and beyond				0
Maturities of long term debt 2018 and beyond				100,000,000
Sun Trust Term Loan
Debt Instrument [Line Items]
Revolving credit facility in the maximum principal amount				150,000,000
Revolving and term loan		$ 100,000,000
JPM Bridge Facility
Debt Instrument [Line Items]
Revolving and term loan		50,000,000
JPMorgan Chase Bank, N.A.
Debt Instrument [Line Items]
Revolving and term loan		50,000,000
Sun Trust Revolver
Debt Instrument [Line Items]
Revolving credit facility in the maximum principal amount				100,000,000
Revolving and term loan		$ 50,000,000
Increase in revolving credit facility				50,000,000
JPM Term Loan
Debt Instrument [Line Items]
Revolving and term loan				$ 100,000,000
Adjusted LIBOR Rate				1.00%
Private Placement
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 100,000,000	100,000,000
Private Placement \| Series A
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 100,000,000
Debt instrument, issuance date				Sep. 15, 2004
Debt instrument interest rate stated percentage				5.57%
Debt instrument, maturity date				Sep. 15, 2011
Notes redeemed				$ 100,000,000
Private Placement \| Series B
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 100,000,000
Debt instrument, issuance date				Jul. 15, 2004
Debt instrument interest rate stated percentage				6.08%
Debt instrument, maturity date				Jul. 15, 2014
Private Placement \| SeniorNotes
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 200,000,000
New Master Agreement
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 0
Maximum shelf facility capacity	$ 125,000,000
Length of the issuance period of long-term debt (in years) \| yr	3
Long-term debt maturity, period length, maximum (in years)	Maturity dates, not to exceed ten years
Line of Credit
Debt Instrument [Line Items]
Lending commitment amount			$ 50,000,000
Potential maximum increase in lending commitment amount			100,000,000
Revolving credit facility in the maximum principal amount			75,000,000
Reduction in maximum principal amount			$ 20,000,000
Letter of credit usage fee, minimum				1.00%
Letter of credit usage fee, maximum				1.40%
LIBOR below base rate				1.00%
Availability fees, minimum				0.175%
Availability fees, maximum				0.25%
Interest rate, minimum				1.00%
Interest rate, maximum				1.40%
Line of Credit \| Sun Trust Revolver
Debt Instrument [Line Items]
Debt instrument, maturity date				Dec. 31, 2016
Master Agreement
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 150,000,000	$ 150,000,000
Maximum shelf facility capacity				$ 200,000,000
Length of the issuance period of long-term debt (in years) \| yr				3
Long-term debt maturity, period length, maximum (in years)				Maturity dates, not to exceed ten years
Master Agreement \| Series C
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 25,000,000
Debt instrument, issuance date				Dec. 22, 2006
Debt instrument interest rate stated percentage				5.66%
Debt instrument, maturity date				Dec. 22, 2016
Master Agreement \| Series D
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 25,000,000
Debt instrument, issuance date				Feb. 01, 2008
Debt instrument interest rate stated percentage				5.37%
Debt instrument, maturity date				Jan. 15, 2015
Master Agreement \| Series E
Debt Instrument [Line Items]
Unsecured senior notes outstanding				$ 100,000,000
Debt instrument, issuance date				Sep. 15, 2011
Debt instrument interest rate stated percentage				4.50%
Debt instrument, maturity date				Sep. 15, 2018
Libor
Debt Instrument [Line Items]
30-day LIBOR Rate				0.23%
30-day Adjusted LIBOR Rate				0.25%

Significant Components of Current Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets [Line Items]
Deferred profit-sharing contingent commissions	$ 9,490	$ 11,124
Net operating loss carryforwards	5,786
Accruals and reserves	9,132	8,739
Total current deferred tax assets	$ 24,408	$ 19,863

Significant Components of Non-Current Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets Liabilities [Line Items]
Fixed assets	$ 12,427	$ 11,400
Net unrealized holding gain of available-for-sale securities		4
Prepaid insurance and pension		3,123
Intangible assets	245,020	176,459
Total non-current deferred tax liabilities	257,447	190,986
Deferred compensation	13,576	11,341
Net operating loss carryforwards	6,658	2,071
Valuation allowance for deferred tax assets	(417)	(478)
Total non-current deferred tax assets	19,817	12,934
Net non-current deferred tax liability	$ 237,630	$ 178,052

Stock-Based Compensation - Additional Information (Detail)	1 Months Ended					12 Months Ended				24 Months Ended
	Dec. 31, 2012 USD ($) $ / shares shares	Jan. 31, 2012 shares	Jan. 31, 2011 shares	Apr. 28, 2010 yr shares	Jul. 31, 2009	Dec. 31, 2012 USD ($) yr $ / shares h shares	Dec. 31, 2011 USD ($) $ / shares shares	Dec. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2009 shares	Dec. 31, 2012 USD ($) $ / shares shares	Aug. 31, 2012 $ / shares shares	Aug. 31, 2011 $ / shares shares	Aug. 31, 2010 $ / shares shares	Apr. 21, 2000 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares met the first condition for vesting and awarded	37,408					37,408				37,408
Total intrinsic value of options exercised \| $						$ 5,780,000	$ 333,000	$ 2,344,000
Unrecognized compensation expense \| $	$ 68,000,000					$ 68,000,000				$ 68,000,000
Unrecognized compensation expense, weighted-average period (in years)						7 years 9 months 18 days
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants or for future subscription	1,734,510					1,734,510				1,734,510
Shares available for issuance or authorized shares	12,000,000					12,000,000				12,000,000
Number of hours worked per week by employees \| h						20
Maximum percentage of allotment through payroll deductions						10.00%
Allotted value, maximum, to purchase Company stock \| $	$ 25,000					$ 25,000				$ 25,000
Subscription Period, beginning						August 1
Subscription Period, ending						July 31
Stock price, percentage	85.00%					85.00%				85.00%
Quoted market price of Company's stock						15.00%
Value of a one-year stock option, percentage	85.00%					85.00%				85.00%
Fair value of an ESPP share option \| $ / shares											$ 5.84	$ 4.27	$ 4.01
Issued shares of common stock											562,748	488,052	500,334
Aggregate purchase price of issued common stock \| $	$ 9,302,000					$ 9,302,000	$ 8,048,000	$ 8,326,000		$ 9,302,000
Aggregate purchase price per share of issued common stock \| $ / shares	$ 16.53					$ 16.53	$ 16.49	$ 16.64		$ 16.53
Shares of common stock subscribed	246,164					246,164	230,481	206,201		246,164
Proceeds by participants \| $	$ 5,278,000					$ 5,278,000	$ 3,810,000	$ 3,400,000		$ 5,278,000
Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of shares made under plan								187,040
Shares met the first condition for vesting and awarded	37,408					37,408	37,408	38,449		37,408
Weighted average grant-date fair value of PSP grants \| $ / shares						$ 22.59	$ 23.94	$ 12.62
Shares available for issuance under the SIP				6,046,768
Vesting period, maximum (in years) \| yr				10
Vesting period, minimum (in years) \| yr				4
Grants made to Decus employees under the SIP sub-plan							2,375,892
Shares issued to Board of Directors as part of their annual compensation	12,610	12,627	11,682							36,919
Shares available for future grants or for future subscription	4,455,517					4,455,517				4,455,517
Shares reserved for grants with PSP-type vesting conditions	2,624,873					2,624,873				2,624,873
Stock Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of options granted (in years)						3 years
Stock Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of options granted (in years)						5 years
Stock Incentive Plan \| Decus
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants made to Decus employees under the SIP sub-plan							24,670	5,205
Stock Incentive Plan \| Arrowhead General Insurance Agency Superholding Corporation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of shares made under plan						814,545
Performance Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares available to be granted under PSP	14,400,000					14,400,000				14,400,000
Incremental increases in 20-trading-day average stock price	20.00%					20.00%				20.00%
Number of years of continuous employment						15 years
Attainment age	Attainment of age 64					Attainment of age 64				Attainment of age 64
Grant of shares made under plan						6,750,253			187,040
Initial stock prices, minimum \| $ / shares						$ 4.25
Initial stock prices, maximum \| $ / shares						$ 25.68
Shares not meeting first condition for vesting	1,296,517					1,296,517				1,296,517
Shares met the first condition for vesting and awarded	2,394,505					2,394,505	3,345,269	3,391,519	4,423,436	2,394,505
Shares distributed to the participants	3,059,231					3,059,231				3,059,231
Weighted average grant-date fair value of PSP grants \| $ / shares						$ 0.00	$ 0.00	$ 9.67
Total fair market value of PSP grants \| $						$ 23,034,000	$ 2,384,000	$ 31,965,000
Performance Stock Plan \| Powell Brown
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of years of continuous employment					20 years
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, maximum (in years) \| yr						10
Vesting period, minimum (in years) \| yr						1
Pre-tax income annual percentage						15.00%
ISOP expiry date						Dec. 31, 2008
Options expire period (in years)						10 years
Incentive Stock Option Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated vesting period (in years)						3 years
Incentive Stock Option Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock subscribed														4,800,000
Accelerated vesting period (in years)						6 years

Aggregate Future Minimum Lease Payments under all Non-cancelable Lease Agreements (Detail) $ in Thousands	Dec. 31, 2012 USD ($)
Schedule of Operating Leases [Line Items]
2013	$ 30,645
2014	26,413
2015	22,189
2016	18,407
2017	12,924
Thereafter	23,299
Total minimum future lease payments	$ 133,877