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Losses and Loss Adjustment Reserve - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Reinsurer | Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00%bro_PercentageOfCededPremiums |
Premiums written net | $ 123,110,000us-gaap_CededPremiumsWritten |
Ceded unpaid loss | 13,100,000us-gaap_ReinsuranceRecoverablesOnUnpaidLosses |
The reinsurance recoverable | 304,100,000us-gaap_ReinsuranceRecoverablesOnUnpaidLossesGross |
Prepaid reinsurance premiums | 291,037,000us-gaap_PrepaidReinsurancePremiums | 320,586,000us-gaap_PrepaidReinsurancePremiums
Reserve for losses and loss adjustment expense | 0bro_ReserveForLossesAndLossAdjustmentExpensesForReinsuranceLiability |
Number of reinsurers | 3bro_NumberOfReinsurers |
Homeowners |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | 8,698us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_ReinsurancePolicyTypeAxis = bro_HomeownersMember |
Reinsurance recoverable, incurred but not reported claims | 102us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_ReinsurancePolicyTypeAxis = bro_HomeownersMember |
Private Passenger Auto Liability |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | 69,026us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_ReinsurancePolicyTypeAxis = bro_PrivatePassengerAutoLiabilityMember |
Reinsurance recoverable, incurred but not reported claims | 39,424us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_ReinsurancePolicyTypeAxis = bro_PrivatePassengerAutoLiabilityMember |
Other Liability |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded unpaid loss | 5,001us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_ReinsurancePolicyTypeAxis = bro_OtherLiabilityMember |
Wright Flood |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded rate of premiums under insurance program | 100.00%bro_PercentageOfCededPremiums / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
Expenses and allowance rate received in premiums | 30.80%bro_PercentageOfReinsuranceRecoverablesAllowance / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
Premiums written net | 122,900,000us-gaap_CededPremiumsWritten / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
Wright Flood | Quota Share Agreement |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Effective cedes rate under quota share agreement | 100.00%bro_PercentageOfFloodPremiumsCeded / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
Commission rate, percent of ceded written premiums | 30.50%bro_ReinsurancePercentageOfCedingCommission / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
Wright Flood | Quota Share Agreement | Ceded Credit Risk, Concentrated Credit Risk |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Ceded amount | $ 200,000us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskRiskClassificationAxis = us-gaap_CededCreditRiskConcentratedCreditRiskMember / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |

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- Definition Number of reinsurers. + References No definition available. + Details
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- Definition Percentage of ceded premiums. + References No definition available. + Details
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- Definition Percentage of flood premiums ceded. + References No definition available. + Details
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- Definition Percentage of reinsurance recoverables allowance. + References No definition available. + Details
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- Definition Reinsurance percentage of ceding commission. + References No definition available. + Details
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- Definition Reserve For Losses And Loss Adjustment Expenses For Reinsurance Liability + References No definition available. + Details
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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prepaid Reinsurance Premiums -URI http://asc.fasb.org/extlink&oid=6521719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
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- Definition Estimated amount after valuation allowance of reinsurance recoverables, due from reinsurers for incurred claims not yet reported, and claims settlement expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 + Details
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- Definition Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount after valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, amounts expected of incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 + Details
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- Definition Amount before valuation allowance of reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer. + References No definition available. + Details
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