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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash | $ 25,365,000 bro_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents | $ 40,360,000 bro_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents | $ 61,786,000 bro_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents
Other current assets | 20,964,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets | 59,598,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets | 71,824,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets
Fixed assets | 8,973,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment | 1,915,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment | 4,937,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment
Reinsurance recoverable | 25,238,000 bro_BusinessAcquisitionPurchasePriceAllocationReinsuranceRecoverables |  |
Prepaid reinsurance premiums | 289,013,000 bro_BusinessAcquisitionPurchasePriceAllocationPrepaidReinsurancePremiums |  |
Goodwill | 513,925,000 us-gaap_GoodwillPeriodIncreaseDecrease | 295,944,000 us-gaap_GoodwillPeriodIncreaseDecrease | 390,640,000 us-gaap_GoodwillPeriodIncreaseDecrease
Purchased customer accounts | 260,424,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets | 118,983,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets | 137,946,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets
Non-compete agreements | 1,194,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross | 2,886,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross | 452,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross
Other assets | 20,045,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets | 108,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets | 1,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets
Total assets acquired | 1,165,141,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired | 519,794,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired | 667,586,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired
Other current liabilities | (14,974,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities | (81,150,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities | (110,188,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities
Losses and loss adjustment reserve | (25,238,000)bro_BusinessAcquisitionsPurchasePriceAllocationLossesAndLossAdjustmentReserve |  |
Unearned premiums | (289,013,000)bro_BusinessAcquisitionPurchasePriceAllocationUnearnedPremium |  |
Deferred income taxes, net | (46,566,000)bro_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetsLiabilities | (22,764,000)bro_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetsLiabilities | (26,488,000)bro_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetsLiabilities
Other liabilities | (32,366,000)bro_BusinessAcquisitionPurchasePriceAllocationOtherLiabilitiesAssumed | (2,165,000)bro_BusinessAcquisitionPurchasePriceAllocationOtherLiabilitiesAssumed |
Total liabilities assumed | (408,157,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed | (106,079,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed | (136,676,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed
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] |  |  |
Cash | 25,365,000 bro_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Other current assets | 16,474,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Fixed assets | 7,172,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Reinsurance recoverable | 25,238,000 bro_BusinessAcquisitionPurchasePriceAllocationReinsuranceRecoverables / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Prepaid reinsurance premiums | 289,013,000 bro_BusinessAcquisitionPurchasePriceAllocationPrepaidReinsurancePremiums / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Goodwill | 420,209,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Purchased customer accounts | 213,677,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Non-compete agreements | 966,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Other assets | 20,045,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Total assets acquired | 1,018,159,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Other current liabilities | (14,322,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Losses and loss adjustment reserve | (25,238,000)bro_BusinessAcquisitionsPurchasePriceAllocationLossesAndLossAdjustmentReserve / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Unearned premiums | (289,013,000)bro_BusinessAcquisitionPurchasePriceAllocationUnearnedPremium / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Deferred income taxes, net | (46,566,000)bro_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetsLiabilities / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Other liabilities | (32,366,000)bro_BusinessAcquisitionPurchasePriceAllocationOtherLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_WrightInsuranceGroupLlcMember |  |
Total liabilities assumed | (407,505,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / 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] |  |  |
Other current assets | 3,647,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Fixed assets | 53,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Goodwill | 76,023,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Purchased customer accounts | 38,111,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Non-compete agreements | 21,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Total assets acquired | 117,855,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Other current liabilities | (403,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Total liabilities assumed | (403,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Net assets acquired | 117,452,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_PacificResourcesBenefitsAdvisorsMember |  |
Axia Strategies, Inc (Axia) [Member] |  |  |
Other current assets | 101,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Fixed assets | 24,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Goodwill | 7,276,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Purchased customer accounts | 4,252,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Non-compete agreements | 41,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Total assets acquired | 11,694,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Net assets acquired | 11,694,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_AxiaStrategiesMember |  |
Other Acquisitions [Member] |  |  |
Other current assets | 742,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 1,573,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 422,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Fixed assets | 1,724,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 24,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 158,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Goodwill | 10,417,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 5,696,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 21,085,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Purchased customer accounts | 4,384,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 5,623,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 13,112,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Non-compete agreements | 166,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 76,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 243,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Other assets |  | 1,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember |
Total assets acquired | 17,433,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 12,993,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | 35,020,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Other current liabilities | (249,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | (194,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | (1,477,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
Total liabilities assumed | (249,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | (194,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember | (1,477,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember
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] |  |  |
Other current assets |  | 393,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Fixed assets |  | 30,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Goodwill |  | 12,697,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Purchased customer accounts |  | 3,878,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Non-compete agreements |  | 31,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Total assets acquired |  | 17,029,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Other current liabilities |  | (866,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Total liabilities assumed |  | (866,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Net assets acquired |  | 16,163,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RollinsAgencyMember |
Beecher Carlson Holdings, Inc. [Member] |  |  |
Cash |  | 40,360,000 bro_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Other current assets |  | 57,632,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Fixed assets |  | 1,786,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Goodwill |  | 265,174,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Purchased customer accounts |  | 101,565,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Non-compete agreements |  | 2,758,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Total assets acquired |  | 469,275,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Other current liabilities |  | (80,090,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Deferred income taxes, net |  | (22,764,000)bro_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetsLiabilities / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Other liabilities |  | (2,165,000)bro_BusinessAcquisitionPurchasePriceAllocationOtherLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Total liabilities assumed |  | (105,019,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
Net assets acquired |  | 364,256,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_BeecherCarlsonHoldingsMember |
ICA, Inc.[Member] |  |  |
Fixed assets |  | 75,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Goodwill |  | 12,377,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Purchased customer accounts |  | 7,917,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Non-compete agreements |  | 21,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Other assets |  | 107,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Total assets acquired |  | 20,497,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Net assets acquired |  | 20,497,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_IcaMember |
Arrowhead General Insurance Agency Superholding Corporation [Member] |  |  |
Cash |  |  | 61,786,000 bro_BusinessAcquisitionsPurchasePriceAllocationCurrentAssetsCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Other current assets |  |  | 69,051,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Fixed assets |  |  | 4,629,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Goodwill |  |  | 321,128,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Purchased customer accounts |  |  | 99,675,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Non-compete agreements |  |  | 100,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Other assets |  |  | 1,000 bro_BusinessAcquisitionsPurchasePriceAllocationOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Total assets acquired |  |  | 556,370,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Other current liabilities |  |  | (107,579,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Deferred income taxes, net |  |  | (26,488,000)bro_BusinessAcquisitionPurchasePriceAllocationDeferredIncomeTaxAssetsLiabilities / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Total liabilities assumed |  |  | (134,067,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Net assets acquired |  |  | 422,303,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember
Insurcorp & GGM Investments LLC [Member] |  |  |
Other current assets |  |  | 180,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Fixed assets |  |  | 25,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Goodwill |  |  | 14,745,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Purchased customer accounts |  |  | 6,490,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Non-compete agreements |  |  | 22,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Total assets acquired |  |  | 21,462,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Other current liabilities |  |  | (118,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Total liabilities assumed |  |  | (118,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Net assets acquired |  |  | 21,344,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_InsuranceCorporationMember
Richard W. Endlar Insurance Agency, Inc. [Member] |  |  |
Other current assets |  |  | 305,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Fixed assets |  |  | 25,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Goodwill |  |  | 8,044,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Purchased customer accounts |  |  | 5,230,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Non-compete agreements |  |  | 11,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Total assets acquired |  |  | 13,615,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Other current liabilities |  |  | (192,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Total liabilities assumed |  |  | (192,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Net assets acquired |  |  | 13,423,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RichardEndlarInsuranceAgencyIncMember
Texas Security General Insurance Agency, Inc. [Member] |  |  |
Other current assets |  |  | 1,866,000 bro_BusinessAcquisitionPurchasePriceAllocationCurrentAssetsPrepaidExpensesAndOtherAssets / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Fixed assets |  |  | 45,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Goodwill |  |  | 10,845,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Purchased customer accounts |  |  | 6,229,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Non-compete agreements |  |  | 14,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Total assets acquired |  |  | 18,999,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Other current liabilities |  |  | (187,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Total liabilities assumed |  |  | (187,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Net assets acquired |  |  | 18,812,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_TexasSecurityGeneralInsuranceAgencyIncMember
Behnke & Associates, Inc. [Member] |  |  |
Fixed assets |  |  | 25,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Goodwill |  |  | 6,430,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Purchased customer accounts |  |  | 3,843,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Non-compete agreements |  |  | 41,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Total assets acquired |  |  | 10,339,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Net assets acquired |  |  | 10,339,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_BehnkeAssociatesIncMember
Rowlands & Barranca Agency, Inc. [Member] |  |  |
Fixed assets |  |  | 30,000 bro_BusinessAcquisitionsPurchasePriceAllocationPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Goodwill |  |  | 8,363,000 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Purchased customer accounts |  |  | 3,367,000 bro_BusinessAcquisitionsPurchasePriceAllocationAmortizableIntangibleAssets / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Non-compete agreements |  |  | 21,000 bro_BusinessAcquisitionsPurchasePriceAllocationNoncompeteAgreementsGross / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Total assets acquired |  |  | 11,781,000 bro_BusinessAcquisitionsPurchasePriceAllocationAssetsAcquired / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Other current liabilities |  |  | (635,000)bro_BusinessAcquisitionsPurchasePriceAllocationCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Total liabilities assumed |  |  | (635,000)bro_BusinessAcquisitionsPurchasePriceAllocationLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember
Net assets acquired |  |  | $ 11,146,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_RowlandsBarrancaAgencyMember

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