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Stock-Based Compensation - Stock Incentive Plan - Additional Information (Detail) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012 | Jan. 31, 2012 | Jan. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Apr. 28, 2010 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted to Board of Directors as part of their annual compensation | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |  |  |  |  |
Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares available for issuance under the SIP |  |  |  |  |  |  |  |  | 6,046,768 bro_SharesAvailableForIssuanceUnderStockIncentivePlan / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |
Grant of shares made under plan | 422,572 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 3,719,974 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |  |  |  | 187,040 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |
Grants made to Decus employees under the SIP sub-plan |  |  |  |  |  |  | 2,375,892 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUnderIncentiveSubPlan / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |
Number of granted shares vested | 113,088 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 891,399 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |  |  |  |  |  |
Shares fulfilling the condition for vesting | 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |  |  |  |  |  |  |
Shares issued to Board of Directors as part of their annual compensation | 9,870 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 0 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 36,919 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 12,610 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 12,627 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 11,682 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 36,919 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |
Shares granted to Board of Directors as part of their annual compensation |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |  |  |  |  |  |
Shares available for future grants or for future subscriptions | 2,309,929 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |  |  |  |  |  |  |
Stock Incentive Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years | 3 years |  |  |  |  |  |  | 4 years |
Expected term of options granted (in years) | 3 years |  |  |  |  |  |  |  |  |
Stock Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 6 years | 7 years |  |  |  |  |  |  | 10 years |
Expected term of options granted (in years) | 5 years |  |  |  |  |  |  |  |  |
Stock Incentive Plan [Member] | Decus [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Grants made to Decus employees under the SIP sub-plan |  |  |  |  |  |  | 24,670 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUnderIncentiveSubPlan / dei_LegalEntityAxis = bro_DecusInsuranceBrokersLimitedMember / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 5,205 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUnderIncentiveSubPlan / dei_LegalEntityAxis = bro_DecusInsuranceBrokersLimitedMember / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |
Stock Incentive Plan [Member] | Arrowhead General Insurance Agency Superholding Corporation [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Grant of shares made under plan |  |  | 814,545 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / dei_LegalEntityAxis = bro_ArrowheadGeneralInsuranceAgencyIncMember / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember |  |  |  |  |  |  |
Performance Stock Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Grant of shares made under plan | 5,549,882 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember |  |  |  |  |  |  |  |  | 187,040 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember

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- Definition Shares available for issuance under the stock incentive plan. + References No definition available. + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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