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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | $ 721,900,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 408,072,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 483,933,000 us-gaap_PaymentsToAcquireBusinessesGross
Note Payable |  |  | 59,000 bro_BusinessAcquisitionCostOfAcquiredEntityNotesPayable
Other Payable |  | 552,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable | 25,439,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable
Net Assets Acquired | 756,984,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | 413,715,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | 530,910,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
The Wright Insurance Group, LLC. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | 609,183,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Net Assets Acquired | 610,654,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Pacific Resources Benefits Advisors, LLC (PacRes) [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | 117,452,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Axia Strategies, Inc (Axia) [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | 11,694,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Other Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired | 17,184,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 12,799,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 33,543,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
The Rollins Agency, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  | 16,163,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Beecher Carlson Holdings, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid |  | 364,256,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Net Assets Acquired |  | 364,256,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
ICA, Inc.[Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  | 20,497,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Arrowhead General Insurance Agency Superholding Corporation [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Other Payable |  |  | 22,061,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Net Assets Acquired |  |  | 422,303,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Richard W. Endlar Insurance Agency, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | 13,423,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Texas Security General Insurance Agency, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | 18,812,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Behnke & Associates, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | 10,339,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Rowlands & Barranca Agency, Inc. [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Net Assets Acquired |  |  | 11,146,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
2014 Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | 721,851,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember |  |
Other Payable | 1,904,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember |  |
Recorded Earn-out Payable | 33,229,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember |  |
Net Assets Acquired | 756,984,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember |  |
Maximum Potential Earn-out Payable | 49,462,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember |  |
2014 Acquisitions [Member] | The Wright Insurance Group, LLC. [Member] | National Programs Divisions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | May 01, 2014 |  |
Cash Paid | 609,183,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsDivisionsMember |  |
Other Payable | 1,471,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsDivisionsMember |  |
Net Assets Acquired | 610,654,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsDivisionsMember |  |
2014 Acquisitions [Member] | Pacific Resources Benefits Advisors, LLC (PacRes) [Member] | Retail [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | May 01, 2014 |  |
Cash Paid | 90,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |  |
Recorded Earn-out Payable | 27,452,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |  |
Net Assets Acquired | 117,452,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |  |
Maximum Potential Earn-out Payable | 35,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |  |
2014 Acquisitions [Member] | Axia Strategies, Inc (Axia) [Member] | Wholesale Brokerage [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition | May 01, 2014 |  |
Cash Paid | 9,870,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember |  |
Recorded Earn-out Payable | 1,824,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember |  |
Net Assets Acquired | 11,694,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember |  |
Maximum Potential Earn-out Payable | 5,200,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember |  |
2014 Acquisitions [Member] | Other Acquisitions [Member] | Various [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid | 12,798,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |  |
Other Payable | 433,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |  |
Recorded Earn-out Payable | 3,953,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |  |
Net Assets Acquired | 17,184,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |  |
Maximum Potential Earn-out Payable | 9,262,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandFourteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |  |
2013 Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid |  | 408,072,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember |
Other Payable |  | 552,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember |
Recorded Earn-out Payable |  | 5,091,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember |
Net Assets Acquired |  | 413,715,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember |
Maximum Potential Earn-out Payable |  | 16,768,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember |
2013 Acquisitions [Member] | Other Acquisitions [Member] | Various [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid |  | 10,254,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Other Payable |  | 502,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Recorded Earn-out Payable |  | 2,043,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Net Assets Acquired |  | 12,799,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Maximum Potential Earn-out Payable |  | 7,468,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
2013 Acquisitions [Member] | The Rollins Agency, Inc. [Member] | Retail [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  | Jun. 01, 2013 |
Cash Paid |  | 13,792,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Other Payable |  | 50,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Recorded Earn-out Payable |  | 2,321,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Net Assets Acquired |  | 16,163,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Maximum Potential Earn-out Payable |  | 4,300,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
2013 Acquisitions [Member] | Beecher Carlson Holdings, Inc. [Member] | Retail And National Programs [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  | Jul. 01, 2013 |
Cash Paid |  | 364,256,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailAndNationalProgramsMember |
Net Assets Acquired |  | 364,256,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailAndNationalProgramsMember |
2013 Acquisitions [Member] | ICA, Inc.[Member] | Services [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  | Dec. 31, 2013 |
Cash Paid |  | 19,770,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_IcaMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_ServicesMember |
Recorded Earn-out Payable |  | 727,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_IcaMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_ServicesMember |
Net Assets Acquired |  | 20,497,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_IcaMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_ServicesMember |
Maximum Potential Earn-out Payable |  | 5,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_IcaMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_TwoThousandThirteenAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_ServicesMember |
2012 Acquisitions [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid |  |  | 483,933,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember
Note Payable |  |  | 59,000 bro_BusinessAcquisitionCostOfAcquiredEntityNotesPayable / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember
Other Payable |  |  | 25,439,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember
Recorded Earn-out Payable |  |  | 21,479,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember
Net Assets Acquired |  |  | 530,910,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember
Maximum Potential Earn-out Payable |  |  | 56,170,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember
2012 Acquisitions [Member] | Other Acquisitions [Member] | Various [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Cash Paid |  |  | 28,192,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember
Note Payable |  |  | 59,000 bro_BusinessAcquisitionCostOfAcquiredEntityNotesPayable / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember
Other Payable |  |  | 296,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember
Recorded Earn-out Payable |  |  | 4,996,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember
Net Assets Acquired |  |  | 33,543,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember
Maximum Potential Earn-out Payable |  |  | 14,149,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember
2012 Acquisitions [Member] | Arrowhead General Insurance Agency Superholding Corporation [Member] | National Programs & Services [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Jan. 09, 2012
Cash Paid |  |  | 396,952,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsAndServicesMember
Other Payable |  |  | 22,061,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsAndServicesMember
Recorded Earn-out Payable |  |  | 3,290,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsAndServicesMember
Net Assets Acquired |  |  | 422,303,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsAndServicesMember
Maximum Potential Earn-out Payable |  |  | 5,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsAndServicesMember
2012 Acquisitions [Member] | Insurcorp & GGM Investments LLC [Member] | Retail [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | May 01, 2012
Cash Paid |  |  | 15,500,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_InsurcorpAndGgmInvestmentsLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Other Payable |  |  | 900,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_InsurcorpAndGgmInvestmentsLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Recorded Earn-out Payable |  |  | 4,944,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_InsurcorpAndGgmInvestmentsLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Net Assets Acquired |  |  | 21,344,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_InsurcorpAndGgmInvestmentsLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Maximum Potential Earn-out Payable |  |  | 17,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_InsurcorpAndGgmInvestmentsLlcMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
2012 Acquisitions [Member] | Richard W. Endlar Insurance Agency, Inc. [Member] | Retail [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | May 01, 2012
Cash Paid |  |  | 10,825,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Recorded Earn-out Payable |  |  | 2,598,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Net Assets Acquired |  |  | 13,423,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Maximum Potential Earn-out Payable |  |  | 5,500,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
2012 Acquisitions [Member] | Texas Security General Insurance Agency, Inc. [Member] | Wholesale Brokerage [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Sep. 01, 2012
Cash Paid |  |  | 14,506,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember
Other Payable |  |  | 2,182,000 bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember
Recorded Earn-out Payable |  |  | 2,124,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember
Net Assets Acquired |  |  | 18,812,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember
Maximum Potential Earn-out Payable |  |  | 7,200,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember
2012 Acquisitions [Member] | Behnke & Associates, Inc. [Member] | Retail [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Dec. 01, 2012
Cash Paid |  |  | 9,213,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Recorded Earn-out Payable |  |  | 1,126,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Net Assets Acquired |  |  | 10,339,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Maximum Potential Earn-out Payable |  |  | 3,321,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
2012 Acquisitions [Member] | Rowlands & Barranca Agency, Inc. [Member] | Retail [Member] |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |
Effective Date of Acquisition |  |  | Dec. 01, 2012
Cash Paid |  |  | 8,745,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Recorded Earn-out Payable |  |  | 2,401,000 bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Net Assets Acquired |  |  | 11,146,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember
Maximum Potential Earn-out Payable |  |  | $ 4,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = bro_AcquisitionsTwoThousandTwelveMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember

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