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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
TRA
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Approximate percentage of earnings not subject to income taxes 20.00%    
Effective tax rate 17.10% 17.80%  
Number of tax receivable agreements (TRAs) | TRA 2    
TRA percent of savings to be paid to shareholders 85.00%    
Tax receivable agreement percentage to be retained by entity 15.00%    
Tax receivable agreement payment period 125 days    
Unrecognized tax benefits $ 1,300   $ 1,300
Deferred Tax Asset - Amortizable basis      
Deferred tax assets, beginning 446,954    
2021 Holdings Common Unit Exchanges 2,228    
Amortization (9,661)    
Deferred tax assets, ending 455,883    
Amounts payable under tax receivable agreements      
Amounts payable under tax receivable, beginning agreements 412,468    
Establishment of amounts payable under tax receivable agreements 15,802 $ 30,853  
Amounts payable under tax receivable, ending agreements 428,270    
Unrecognized tax benefits, income tax penalties accrued 200   200
Unrecognized tax benefits $ 1,300   $ 1,300
Statutory tax rate 21.00%    
Capital Unit      
Amounts payable under tax receivable agreements      
Establishment of amounts payable under tax receivable agreements $ 1,894    
LIBOR      
Tax receivable, basis point spread on variable rate (as a percent) 100