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Stock-Based Compensation - Summary of Performance Stock Plan Activity (Detail) (Performance Stock Plan [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Performance Stock Plan [Member] |  |  |
Weighted-Average Grant Date Fair Value |  |  |
Weighted-Average Grant Date Fair Value, Awarded |  | $ 10.25 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 8.09 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Weighted-Average Grant Date Fair Value, Outstanding beginning balance | $ 8.62 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 8.72 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 8.08 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Weighted-Average Grant Date Fair Value, Granted |  |  |
Weighted-Average Grant Date Fair Value, Vested | $ 16.76 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 4.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 3.29 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Weighted-Average Grant Date Fair Value, Forfeited | $ 9.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 8.73 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 13.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Weighted-Average Grant Date Fair Value, Outstanding ending balance | $ 8.71 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 8.62 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | $ 8.72 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Granted Shares |  |  |
Granted Shares, Outstanding beginning balance | 2,371,287 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 3,691,022 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 4,931,812 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Granted Shares, Granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Granted Shares, Awarded |  | 122,021 bro_ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 7,743 bro_ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Granted Shares, Vested | (277,009)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (119,364)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (877,224)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Granted Shares, Forfeited | (165,647)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (1,200,371)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (363,566)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Granted Shares, Outstanding ending balance | 1,928,631 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 2,371,287 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 3,691,022 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Awarded Shares |  |  |
Awarded Shares, Outstanding beginning balance | 2,295,852 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 2,394,505 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 3,345,269 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Awarded Shares, Granted | 0 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 0 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 0 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodPriorYearAwardsIssuedGrantedInCurrentYear / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Awarded Shares, Awarded |  | 122,021 bro_ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 7,743 bro_ShareBasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Awarded Shares, Vested | (277,009)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (119,364)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (877,224)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Awarded Shares, Forfeited | (115,630)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (101,310)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (81,283)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Awarded Shares, Outstanding ending balance | 1,903,213 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 2,295,852 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 2,394,505 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedSharesOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Shares Not Yet Awarded |  |  |
Shares Not Yet Awarded, Outstanding beginning balance | 75,435 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 1,296,517 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 1,586,543 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Shares Not Yet Awarded, Granted | 0 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 0 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 0 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsNotYetAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Shares Not Yet Awarded, Awarded |  | (122,021)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (7,743)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNotYetAwardedInPeriod / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Shares Not Yet Awarded, Forfeited | (50,017)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (1,099,061)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | (282,283)bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodNotYetAwardedShares / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Shares Not Yet Awarded, Outstanding ending balance | 25,418 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 75,435 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 1,296,517 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesNotYetAwardedOutstandingNumber / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember

X
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options awarded in period weighted average grant date fair value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options forfeited in period awarded shares. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Prior Year Awards Issued Granted In Current Year + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants not yet awarded in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested in period awarded shares. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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