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Statutory Financial Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	May 20, 2014	Dec. 31, 2014
WNFIC [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus		$ 10.9us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember
Statutory net Income		2.3us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember
Issuance and payment of extraordinary dividend	7.0bro_PaymentsOfExtraordinaryDividends / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember
Regulatory Authorities [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus		$ 7.5us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance / us-gaap_SubsegmentsAxis = bro_RegulatoryMember

X

- Definition

Payments of extraordinary dividends.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

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X

- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.23(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 24

-Subparagraph c

-Article 7

+ Details

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Period Type:	instant

X

- Definition

Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.23(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 24

-Subparagraph c

-Article 7

+ Details

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- Details

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Namespace Prefix:
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X

- Details

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