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Long-Term Debt - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended
	Jan. 09, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 20, 2014	Apr. 17, 2014	Apr. 16, 2014	Jun. 30, 2013
Debt Instrument [Line Items]
Revolving and term loan	$ 50,000,000bro_DebtInstrumentRevolvingAndTermLoan
Credit facility, outstanding amount		529,375,000us-gaap_LineOfCredit	230,000,000us-gaap_LineOfCredit
Potential increased in line of credit facility						500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Unsecured revolving credit facility						800,000,000bro_UnsecuredRevolvingCreditFacility
Unsecured term loans						550,000,000us-gaap_UnsecuredLongTermDebt
Term Loan Agreement		475,000,000us-gaap_RepaymentsOfLinesOfCredit	31,863,000us-gaap_RepaymentsOfLinesOfCredit	100,000,000us-gaap_RepaymentsOfLinesOfCredit
Letter of credit fees		0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Proceeds from lines of credit		475,000,000us-gaap_ProceedsFromLinesOfCredit	31,863,000us-gaap_ProceedsFromLinesOfCredit	100,000,000us-gaap_ProceedsFromLinesOfCredit
Interest paid		25,115,000us-gaap_InterestPaid	16,501,000us-gaap_InterestPaid	16,090,000us-gaap_InterestPaid
Maturities of long term debt 2015		45,625,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Maturities of long term debt 2016		73,125,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Maturities of long term debt 2017		55,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Maturities of long term debt 2018		155,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Maturities of long term debt 2019		371,250,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Maturities of long term debt 2024		500,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Agreement [Member]
Debt Instrument [Line Items]
Term Loan Agreement					230,000,000us-gaap_RepaymentsOfLinesOfCredit / us-gaap_FinancialInstrumentAxis = bro_AgreementMember
Credit Agreement [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount		550,000,000us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = bro_CreditAgreementMember
Unsecured revolving credit facility						1,350,000,000bro_UnsecuredRevolvingCreditFacility / us-gaap_DebtInstrumentAxis = bro_CreditAgreementMember
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage		4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = bro_UnsecuredSeniorNotesMember
Debt instrument, face amount		500,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = bro_UnsecuredSeniorNotesMember
Debt instrument maturity year		2024
Sun Trust Term Loan [Member]
Debt Instrument [Line Items]
Revolving and term loan	100,000,000bro_DebtInstrumentRevolvingAndTermLoan / us-gaap_LineOfCreditFacilityAxis = bro_SunTrustTermLoanMember
Sun Trust Revolver [Member]
Debt Instrument [Line Items]
Revolving and term loan	50,000,000bro_DebtInstrumentRevolvingAndTermLoan / us-gaap_LineOfCreditFacilityAxis = bro_SunTrustRevolverMember
JPM Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Dec. 31, 2016
Revolving and term loan		100,000,000bro_DebtInstrumentRevolvingAndTermLoan / us-gaap_LineOfCreditFacilityAxis = bro_JpmTermLoanMember
Wells Fargo Revolver [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Dec. 31, 2016
Credit facility, outstanding amount							25,000,000us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Increase in revolving credit facility		50,000,000bro_LineOfCreditFacilityIncreaseInBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Potential increased in line of credit facility		100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Borrowings outstanding		0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember	0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Wells Fargo Revolver [Member] | Beecher Acquisition [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount								50,000,000us-gaap_LineOfCredit / dei_LegalEntityAxis = bro_BeecherMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Bank Of America Loan Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Dec. 31, 2016
Bank Of America Loan Term Loan [Member] | Beecher Acquisition [Member]
Debt Instrument [Line Items]
Revolving and term loan								30,000,000us-gaap_LongTermLoansFromBank / dei_LegalEntityAxis = bro_BeecherMember / us-gaap_LineOfCreditFacilityAxis = bro_BankOfAmericaLoanOneMember
Master Agreement [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		150,000,000us-gaap_UnsecuredDebt / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember	150,000,000us-gaap_UnsecuredDebt / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Master Agreement [Member] | Series C [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		25,000,000us-gaap_UnsecuredDebt / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesCMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Debt instrument, issuance date		Dec. 22, 2006
Debt instrument interest rate stated percentage		5.66%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesCMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Debt instrument, maturity date		Dec. 22, 2016
Master Agreement [Member] | Series D [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		25,000,000us-gaap_UnsecuredDebt / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesDMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Debt instrument, issuance date		Feb. 01, 2008
Debt instrument interest rate stated percentage		5.37%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesDMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Debt instrument, maturity date		Jan. 15, 2015
Notes redeemed		25,000,000us-gaap_RepaymentsOfUnsecuredDebt / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesDMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Master Agreement [Member] | Series E [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		100,000,000us-gaap_UnsecuredDebt / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesEMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Debt instrument, issuance date		Sep. 15, 2011
Debt instrument interest rate stated percentage		4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = bro_SeriesEMember / us-gaap_TradingActivityByTypeAxis = bro_MasterAgreementMember
Debt instrument, maturity date		Sep. 15, 2018
LIBOR [Member]
Debt Instrument [Line Items]
30-day Adjusted LIBOR Rate		0.19%bro_AdjustedLiborRate / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
Line of Credit [Member] | Sun Trust Revolver [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date		Dec. 31, 2016
Line of Credit [Member] | Wells Fargo Revolver [Member]
Debt Instrument [Line Items]
Letter of credit usage fee, minimum		1.00%bro_LetterOfCreditUsageFeeMinimum / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Letter of credit usage fee, maximum		1.40%bro_LetterOfCreditUsageFeeMaximum / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
LIBOR below base rate		1.00%bro_LiborRateBelowBaseRate / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Availability fees, minimum		0.175%bro_FeesOnLoansMinimum / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Availability fees, maximum		0.25%bro_FeesOnLoansMaximum / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Interest rate, minimum		1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Interest rate, maximum		1.40%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_WellsFargoMember
Line of Credit [Member] | Bank Of America Loan Term Loan [Member]
Debt Instrument [Line Items]
Revolving and term loan		30,000,000us-gaap_LongTermLoansFromBank / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bro_BankOfAmericaLoanOneMember
Term Loan [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount					550,000,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = bro_TermLoanMember
Line of credit facility interest rate above adjusted LIBOR rate		1.375%bro_LineOfCreditFacilityInterestRateAboveLibor / us-gaap_CreditFacilityAxis = bro_TermLoanMember
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, outstanding amount		475,000,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember			375,000,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Line of credit facility interest rate above adjusted LIBOR rate		1.175%bro_LineOfCreditFacilityInterestRateAboveLibor / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Loans [Member]
Debt Instrument [Line Items]
Proceeds from lines of credit		0us-gaap_ProceedsFromLinesOfCredit / us-gaap_CreditFacilityAxis = bro_RevolvingLoansMember
Private Placement [Member] | Series A [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		100,000,000us-gaap_UnsecuredDebt / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesAMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Debt instrument, issuance date		Sep. 15, 2004
Debt instrument interest rate stated percentage		5.57%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesAMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Debt instrument, maturity date		Sep. 15, 2011
Private Placement [Member] | Series B [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		100,000,000us-gaap_UnsecuredDebt / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesBMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Debt instrument, issuance date		Jul. 15, 2004
Debt instrument interest rate stated percentage		6.08%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_AuctionMarketPreferredSecuritiesStockSeriesAxis = us-gaap_SeriesBMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember
Debt instrument, maturity date		Jul. 15, 2014
Private Placement [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Unsecured senior notes outstanding		$ 200,000,000us-gaap_UnsecuredDebt / us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis = us-gaap_SeniorNotesMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember

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Adjusted LIBOR rate

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Debt instrument, revolving and term loan

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Debt Instruments Maturity Year

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Fees On Loans Maximum

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Face (par) amount of debt instrument at time of issuance.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Date the debt instrument was issued, in CCYY-MM-DD format.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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