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Statutory Financial Information - Additional Information (Detail) (Wright Flood, USD $)
0 Months Ended 3 Months Ended
May 20, 2014
Mar. 31, 2015
Wright Flood
   
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus required   $ 7,500,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired
/ us-gaap_SubsegmentsAxis
= bro_WrightNationalFloodInsuranceCompanyMember
Statutory capital and surplus   11,500,000us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_SubsegmentsAxis
= bro_WrightNationalFloodInsuranceCompanyMember
Statutory net Income   600,000us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_SubsegmentsAxis
= bro_WrightNationalFloodInsuranceCompanyMember
Issuance and payment of extraordinary dividend $ 7,000,000bro_PaymentsOfExtraordinaryDividends
/ us-gaap_SubsegmentsAxis
= bro_WrightNationalFloodInsuranceCompanyMember
$ 7,000,000bro_PaymentsOfExtraordinaryDividends
/ us-gaap_SubsegmentsAxis
= bro_WrightNationalFloodInsuranceCompanyMember