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Subsidiary Dividend Restrictions - Additional Information (Detail) (Wright Flood, USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 20, 2014 | Mar. 31, 2015 | May 21, 2015
Dividend Restrictions [Line Items] |  |  |
Dividend rate as a percentage of net income |  | 100.00%us-gaap_FairValueAssumptionsExpectedDividendRate |
Ordinary dividends payment description |  | The maximum amount of ordinary dividends that Wright Flood 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 Wright Flood’s last annual statement on file with the superintendent or 100% of adjusted net income. |
Payment of extraordinary dividends | $ 7.0bro_PaymentsOfExtraordinaryDividends | $ 7.0bro_PaymentsOfExtraordinaryDividends |
Scenario, Forecast |  |  |
Dividend Restrictions [Line Items] |  |  |
Maximum dividend payout that may be made without prior approval |  |  | $ 2.3us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember / us-gaap_SubsegmentsAxis = bro_WrightNationalFloodInsuranceCompanyMember
Maximum |  |  |
Dividend Restrictions [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 |

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- 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 Amount of dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + 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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