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Stock-Based Compensation - Non-Cash Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | $ 19,363 us-gaap_ShareBasedCompensation | $ 22,603 us-gaap_ShareBasedCompensation | $ 15,865 us-gaap_ShareBasedCompensation
Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | 14,447 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 15,934 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember | 9,288 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_StockIncentivePlanMember
Performance Stock Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | 2,354 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 2,310 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember | 2,612 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_PerformanceStockPlanMember
Incentive Stock Option Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | 137 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_IncentiveStockOptionPlanMember | 821 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_IncentiveStockOptionPlanMember | 1,109 us-gaap_ShareBasedCompensation / us-gaap_PlanNameAxis = bro_IncentiveStockOptionPlanMember
Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Non-cash stock-based compensation expense | $ 2,425 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | $ 3,538 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember | $ 2,856 us-gaap_ShareBasedCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=bro_IncentiveStockOptionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=bro_PerformanceStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=bro_StockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_EmployeeStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |