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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
	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	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance under the SIP									6,046,768bro_SharesAvailableForIssuanceUnderStockIncentivePlan / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Grant of shares made under plan	422,572us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	3,719,974us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember						187,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Grants made to Decus employees under the SIP sub-plan							2,375,892bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUnderIncentiveSubPlan / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Number of granted shares vested	113,088us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	891,399us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Shares fulfilling the condition for vesting	0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Shares issued to Board of Directors as part of their annual compensation	9,870us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	36,919us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	12,610us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	12,627us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	11,682us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	36,919us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Shares granted to Board of Directors as part of their annual compensation		0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Shares available for future grants or for future subscriptions	2,309,929us-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							24,670bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUnderIncentiveSubPlan / dei_LegalEntityAxis = bro_DecusInsuranceBrokersLimitedMember / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember	5,205bro_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			814,545us-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	5,549,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember									187,040us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember

X

- Definition

Share based compensation arrangement by share based payment award options grants in period under the incentive sub plan.

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Shares available for issuance under the stock incentive plan.

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- Definition

Number of shares for which recognition of compensation cost was accelerated.

+ References

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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



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-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



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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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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.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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- Definition

Net number of share options (or share units) granted during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

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- Definition

Gross number of share options (or share units) granted during the period.

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Number of options vested.

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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

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-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



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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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