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Employee Savings Plan - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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	$ 15,752us-gaap_DefinedBenefitPlanContributionsByEmployer	$ 14,819us-gaap_DefinedBenefitPlanContributionsByEmployer	$ 14,266us-gaap_DefinedBenefitPlanContributionsByEmployer

X

- 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

X

- 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

X

- Details

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

X

- 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

X

- 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