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Stock-Based Compensation - Employee Stock Purchase Plan - Additional Information (Detail) (Employee Stock Purchase Plan [Member], USD $) | 12 Months Ended |  |  |  |  |  |  |  |
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Dec. 31, 2014 H | Aug. 31, 2014 | Jul. 31, 2014 | Dec. 31, 2013 | Aug. 31, 2013 | Jul. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2012 | Jul. 31, 2012
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for issuance or authorized shares |  |  |  | 12,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |
Shares available for future grants or for future subscription | 734,317 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Number of hours worked per week by employees | 20 bro_ThresholdPeriodWorkedPerWeekByEmployees / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Maximum percentage of allotment through payroll deductions | 10.00%bro_MaximumPercentageOfAllotmentThroughPayrollDeductions / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Allotted value, maximum, to purchase Company stock | $ 25,000 bro_AllottedValueMaximum / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Subscription Period, beginning | August 1 |  |  |  |  |  |  |  |
Subscription Period, ending | July 31 |  |  |  |  |  |  |  |
Stock price, percentage | 85.00%bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfStockPrice / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Quoted market price of Company's stock | 15.00%bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentOfMarketPrice / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Value of a one-year stock option, percentage | 85.00%bro_ValueOfOneYearStockOptionPercentage / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Fair value of an ESPP share option |  | $ 6.39 bro_EstimatedFairValuePerShareOption / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | $ 8.36 bro_EstimatedFairValuePerShareOption / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | $ 5.84 bro_EstimatedFairValuePerShareOption / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
Issued shares of common stock |  |  | 512,521 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssued / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 487,672 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssued / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 562,748 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssued / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember
Aggregate purchase price of issued common stock | 13,408,000 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchaseValue / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 10,456,000 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchaseValue / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 9,302,000 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchaseValue / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |
Aggregate purchase price per share of issued common stock | $ 26.16 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchasePricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | $ 21.44 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchasePricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | $ 16.53 bro_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAggregatePurchasePricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |
Shares of common stock subscribed | 235,794 us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 222,526 us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | 246,164 us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |
Proceeds by participants | $ 6,277,000 bro_CashReceivedFromProceedsByParticipants / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | $ 5,937,000 bro_CashReceivedFromProceedsByParticipants / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |  | $ 5,278,000 bro_CashReceivedFromProceedsByParticipants / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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