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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	May 03, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 3,800	$ 2,200	$ 11,900	$ 5,400
Unvested Restricted Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Fair value of awards that vested in period				$ 5,700
Aggregate value of nonvested awards	$ 1,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Aggregate value of nonvested awards	$ 3,100
BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Cliff Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Minimum \| BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Ratable Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Maximum \| Executive Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of nonvested awards	$ 8,800
Maximum \| BRP Group, Inc. Omnibus Incentive and Partnership Inducement Award Plans \| Ratable Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				5 years
Common Class A \| Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards authorized by Plan (in shares)		3,844,044		3,844,044
Common Class A \| BRP Group, Inc. Partnership Inducement Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards authorized by Plan (in shares)		1,500,000		1,500,000