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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Significant non-cash investing and financing activities |  |
Other payable issued for purchased customer accounts | $ 1,547 | $ 608
Estimated acquisition earn-out payables and related charges | $ 13,978 | $ 18,155

X
- Definition Obligations of a business that arise from the acquisition of merchandise, materials, supplies and services used in the production and/or sale of goods and services not classified as Trade Payables. + References No definition available. + Details
Name: | bro_OtherPayables
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Recorded Earn-out Payable + References No definition available. + Details
Name: | bro_RecordedEarnOutPayable
Namespace Prefix: | bro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration