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Shareholders' Equity - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 08, 2014 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 02, 2014 | Jul. 21, 2014
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  | $ 25,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |
Shares repurchased, number of shares received initially |  | 2,385,000 us-gaap_TreasuryStockShares |  | 0 us-gaap_TreasuryStockShares |  |
Fair value of common stock repurchased |  | 75,025,000 us-gaap_TreasuryStockValue |  |  |  |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased, aggregate repurchase amount | 50,000,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |  |  |  | 50,000,000 us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |
Shares repurchased, remaining amount | 7,500,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |  |  |  |  |
Shares repurchased, number of shares received initially | 246,000 us-gaap_TreasuryStockShares / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |  |  |  | 1,293,760 us-gaap_TreasuryStockShares / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |
Fair value of common stock repurchased |  |  |  |  | 42,500,000 us-gaap_TreasuryStockValue / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |
Total number of shares repurchased | 1,539,760 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember | 2,384,760 us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bro_AcceleratedShareRepurchaseAgreementMember |  |  |  |
Maximum [Member] |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  |  |  | $ 200,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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