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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		$ 439,819,000us-gaap_CededPremiumsWritten
Ceded amount	333,600,000us-gaap_ReinsuranceRecoverables	333,600,000us-gaap_ReinsuranceRecoverables
Ceded unpaid loss	13,000,000us-gaap_ReinsuranceRecoverablesOnUnpaidLosses	13,000,000us-gaap_ReinsuranceRecoverablesOnUnpaidLosses
Prepaid reinsurance premium	320,586,000us-gaap_PrepaidReinsurancePremiums	320,586,000us-gaap_PrepaidReinsurancePremiums
Reserve for losses and loss adjustment expense	0bro_ReserveForLossesAndLossAdjustmentExpensesForReinsuranceLiability	0bro_ReserveForLossesAndLossAdjustmentExpensesForReinsuranceLiability
Number of reinsurers	3bro_NumberOfReinsurers
Homeowners [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Reinsurance recoverable, incurred but not reported claims	102us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bro_HomeownersMember	102us-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	39,424us-gaap_ReinsuranceReceivablesIncurredButNotReportedClaims / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = bro_PrivatePassengerAutoLiabilityMember	39,424us-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		439,813,000us-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	800,000us-gaap_ReinsuranceRecoverables / us-gaap_CededCreditRiskRiskClassificationAxis = us-gaap_CededCreditRiskConcentratedCreditRiskMember / us-gaap_PlanNameAxis = bro_QuotaShareAgreementMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember	800,000us-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	8,698us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_SubsegmentsAxis = bro_HomeownersAndPrivatePassengerMember	8,698us-gaap_ReinsuranceRecoverablesOnUnpaidLosses / us-gaap_SubsegmentsAxis = bro_HomeownersAndPrivatePassengerMember
Ceded loss adjustment expenses		$ 61,634bro_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

Ceded loss adjustment expenses.

+ References

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- Definition

Number of reinsurers.

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- Definition

Percentage of ceded premiums.

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Percentage of flood premiums ceded.

+ References

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- Definition

Percentage of reinsurance recoverables allowance.

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- Definition

Reinsurance percentage of ceding commission.

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- Definition

Reserve For Losses And Loss Adjustment Expenses For Reinsurance Liability

+ References

No definition available.

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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

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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

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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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

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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



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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

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-SubTopic 310

-Section 45

-Paragraph 6

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