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Employee Savings Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
Number of days of service required for employee to participate | 30 days |  |
Employer contributions to plan, maximum percentage | 4.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent | 2.50%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |
Discretionary profit-sharing contribution percentage based on employee's compensation | 1.50%bro_DiscretionaryProfitSharingContributionPercentageOfEmployeeSSalary |  |
Employer contributions to the plan | $ 15,752 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 14,819 us-gaap_DefinedBenefitPlanContributionsByEmployer | $ 14,266 us-gaap_DefinedBenefitPlanContributionsByEmployer

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- Definition Discretionary profit-sharing contribution percentage of the employee's salary. + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Service period eligible to participate for employee savings plan. + References No definition available. + Details
Name: | bro_ServicePeriodEligibleToParticipateForEmployeeSavingsPlan
Namespace Prefix: | bro_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration