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Business Combinations - Acquisitions Accounted for Business Combinations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | $ 36,195us-gaap_PaymentsToAcquireBusinessesGross | $ 1,000us-gaap_PaymentsToAcquireBusinessesGross
Other Payable | 5bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable |
Recorded Earn-Out Payable | 5,653bro_BusinessAcquisitionsContingentConsiderationAtFairValue |
Net Assets Acquired | 41,853us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |
Maximum Potential Earn- Out Payable | 14,912us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh |
Liberty Insurance Brokers, Inc. and Affiliates (Liberty) |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 13,436us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_LibertyInsuranceBrokersInc.andAffiliatesMember |
Liberty Insurance Brokers, Inc. and Affiliates (Liberty) | Retail |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Feb. 01, 2015 |
Cash Paid | 12,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_LibertyInsuranceBrokersInc.andAffiliatesMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Other Payable | 0bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_LibertyInsuranceBrokersInc.andAffiliatesMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Recorded Earn-Out Payable | 1,436bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_LibertyInsuranceBrokersInc.andAffiliatesMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Net Assets Acquired | 13,436us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_LibertyInsuranceBrokersInc.andAffiliatesMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Maximum Potential Earn- Out Payable | 3,750us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_LibertyInsuranceBrokersInc.andAffiliatesMember / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Spain Agency, Inc. |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 23,431us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_SpainAgencyInc.Member |
Spain Agency, Inc. | Retail |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Effective Date of Acquisition | Mar. 01, 2015 |
Cash Paid | 20,681us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_SpainAgencyInc.Member / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Other Payable | 0bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_SpainAgencyInc.Member / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Recorded Earn-Out Payable | 2,750bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_SpainAgencyInc.Member / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Net Assets Acquired | 23,431us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_SpainAgencyInc.Member / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Maximum Potential Earn- Out Payable | 9,162us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_SpainAgencyInc.Member / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |
Other |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Net Assets Acquired | 4,986us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember |
Other | Various |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |
Cash Paid | 3,514us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Other Payable | 5bro_BusinessAcquisitionCostOfAcquiredEntityOtherPayable / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Recorded Earn-Out Payable | 1,467bro_BusinessAcquisitionsContingentConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Net Assets Acquired | 4,986us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |
Maximum Potential Earn- Out Payable | $ 2,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = bro_OtherAcquisitionsMember / us-gaap_StatementBusinessSegmentsAxis = bro_VariousMember |

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- Definition Business Acquisitions Contingent Consideration At Fair Value + References No definition available. + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Details
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