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Business Combinations - Additional Information (Detail) (USD $) | 3 Months Ended |  |
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Mar. 31, 2015 acquisition customer_account | Mar. 31, 2014 acquisition | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |
Number of acquisitions | 3us-gaap_NumberOfBusinessesAcquired | 1us-gaap_NumberOfBusinessesAcquired |  |
Number of customer accounts acquired | 2bro_BusinessCombinationNumberofCustomerAccountsAcquired |  |  |
Aggregate purchase price of acquisitions | $ 634,680bro_BusinessAcquisitionsPurchasePriceAllocationAdjustmentPurchasePrice |  |  |
Cash payment for acquisition | 36,195,000us-gaap_PaymentsToAcquireBusinessesGross | 1,000,000us-gaap_PaymentsToAcquireBusinessesGross |  |
Goodwill assigned | 29,418,000us-gaap_GoodwillFairValueDisclosure |  |  |
Goodwill currently deductible for income tax purposes | 23,959,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount |  |  |
Goodwill currently non-deductible for income tax purposes | (194,000)bro_BusinessAcquisitionPurchasePriceAllocationGoodwillNonDeductibleAmount |  |  |
Goodwill related to the recorded earn-out payables | 5,653,000bro_EarnOutPayableNotDeductibleUntilEarnedPaid |  |  |
Total revenues related to acquisitions | 1,726,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  |  |
Income before income taxes related to acquisitions | 294,000bro_BusinessCombinationProFormaInformationIncomeLossBeforeIncomeTaxesOfAcquireeSinceAcquisitionDateActual |  |  |
Estimated acquisition earn-out payables | 77,709,000bro_BusinessAcquisitionEarnOutPayables | 48,806,000bro_BusinessAcquisitionEarnOutPayables | 75,283,000bro_BusinessAcquisitionEarnOutPayables | 43,058,000bro_BusinessAcquisitionEarnOutPayables
Accounts payable |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | 29,300,000bro_BusinessAcquisitionEarnOutPayables / us-gaap_ExtinguishmentOfDebtAxis = us-gaap_AccountsPayableMember |  |  |
Purchased customer accounts |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 15 years |  |  |
Non-compete agreements |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average life (years) | 5 years |  |  |
Retail |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 26,461,000us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = bro_RetailMember |  |  |
National Programs |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | (194,000)us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = bro_NationalProgramsMember |  |  |
Wholesale Brokerage |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill assigned | 3,151,000us-gaap_GoodwillFairValueDisclosure / us-gaap_StatementBusinessSegmentsAxis = bro_WholesaleBrokerageMember |  |  |
Other non-current liability |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated acquisition earn-out payables | $ 48,400,000bro_BusinessAcquisitionEarnOutPayables / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember |  |  |

X
- Definition Business acquisition earn out payables. + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of goodwill not deductible for tax purposes. + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Business acquisitions purchase price allocation adjustment purchase price. + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Combination, Number of Customer Accounts Acquired + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Business Combination Pro Forma Information Income Loss Before Income Taxes Of Acquiree Since Acquisition Date Actual + References No definition available. + Details
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Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Earn out payable not deductible until earned paid + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + 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 (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value portion of asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Balance Type: | na
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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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