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Losses and Loss Adjustment Reserve - Additional Information (Detail) (USD $) | 8 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Sep. 30, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Ceded rate of premiums under insurance program | 100.00%bro_PercentageOfCededPremiums | 100.00%bro_PercentageOfCededPremiums |
Premiums written net |  | $ 439,819,000 us-gaap_CededPremiumsWritten |
Ceded amount | 333,600,000 us-gaap_ReinsuranceRecoverables | 333,600,000 us-gaap_ReinsuranceRecoverables |
Ceded unpaid loss | 13,000,000 us-gaap_ReinsuranceRecoverablesOnUnpaidLosses | 13,000,000 us-gaap_ReinsuranceRecoverablesOnUnpaidLosses |
Prepaid reinsurance premium | 320,586,000 us-gaap_PrepaidReinsurancePremiums | 320,586,000 us-gaap_PrepaidReinsurancePremiums |
Reserve for losses and loss adjustment expense | 0 bro_ReserveForLossesAndLossAdjustmentExpensesForReinsuranceLiability | 0 bro_ReserveForLossesAndLossAdjustmentExpensesForReinsuranceLiability |
Number of reinsurers | 3 bro_NumberOfReinsurers |  |
Homeowners [Member] |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Reinsurance recoverable, incurred but not reported claims | 102 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bro_HomeownersMember | 102 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bro_HomeownersMember |
Private Passenger Auto Liability [Member] |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Reinsurance recoverable, incurred but not reported claims | 39,424 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bro_PrivatePassengerAutoLiabilityMember | 39,424 us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bro_PrivatePassengerAutoLiabilityMember |
WNFIC [Member] |  |  |
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 | 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 | 30.80%bro_PercentageOfReinsuranceRecoverablesAllowance / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember | 30.70%bro_PercentageOfReinsuranceRecoverablesAllowance / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember
Premiums written net |  | 439,813,000 us-gaap_CededPremiumsWritten / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
WNFIC [Member] | Quota Share Agreement [Member] |  |  |
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 | 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 | 30.50%bro_ReinsurancePercentageOfCedingCommission / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
WNFIC [Member] | Ceded Credit Risk, Concentrated Credit Risk [Member] | Quota Share Agreement [Member] |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Ceded amount | 800,000 us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskRiskClassificationAxis = us-gaap_CededCreditRiskConcentratedCreditRiskMember / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember | 800,000 us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskRiskClassificationAxis = us-gaap_CededCreditRiskConcentratedCreditRiskMember / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |
Homeowners and Private Passenger [Member] |  |  |
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_HomeownersAndPrivatePassengerMember | 100.00%bro_PercentageOfCededPremiums / us-gaap_SubsegmentsAxis = bro_HomeownersAndPrivatePassengerMember |
Ceded unpaid loss | 8,698 us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_SubsegmentsAxis = bro_HomeownersAndPrivatePassengerMember | 8,698 us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_SubsegmentsAxis = bro_HomeownersAndPrivatePassengerMember |
Ceded loss adjustment expenses |  | $ 61,634 bro_CededLossAdjustmentExpenses / us-gaap_SubsegmentsAxis = bro_HomeownersAndPrivatePassengerMember |
FEMA [Member] |  |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |  |
Percentage of reinsurance |  | 100.00%bro_PercentageOfReinsurance / us-gaap_UnderlyingAssetClassAxis = bro_FederalAgencyMember |

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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 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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