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Subsidiary Dividend Restrictions - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 20, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Payment of dividend | $ 59,334,000 us-gaap_PaymentsOfDividends | $ 53,546,000 us-gaap_PaymentsOfDividends | $ 49,534,000 us-gaap_PaymentsOfDividends |
WNFIC [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Dividend rate as a percentage of net income | 100.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |  |  |
Payment of ordinary dividend | May 21, 2015 |  |  |
Payment of extra ordinary dividend |  |  |  | 7,000,000 bro_PaymentsOfExtraordinaryDividends / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember
Ordinary dividends payment description | The maximum amount of ordinary dividends that WNFIC can pay to shareholders in a rolling twelve month period is limited to the greater of 10% of statutory adjusted capital and surplus as shown on WNFIC's last annual statement on file with the superintendent or 100% of adjusted net income. |  |  |
WNFIC [Member] | Maximum [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Dividend rate as a percentage of net income | 10.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |  |  |
Payment of dividend | $ 2,300,000 us-gaap_PaymentsOfDividends / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember |  |  |

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- Definition Dividend Payment Date Day Month And Year + References No definition available. + Details
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- Definition Payments of extraordinary dividends. + References No definition available. + Details
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Disclosure of statutory restrictions on the payment of dividends as prescribed by the National Association of Insurance Commissioners or state regulatory authorities, amounts not available for future dividend payments, and amount of dividends paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529 + Details
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