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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
USD ($)
TRA
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Approximate percentage of earnings not subject to income taxes 20.00%    
Effective tax rate 18.30%    
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 4,500    
Amortization (19,494)    
Deferred tax assets, ending 448,322    
Amounts payable under TRAs      
Amounts payable under tax receivable, beginning agreements 412,468    
Establishment of amounts payable under tax receivable agreements 17,733 $ 37,110  
Payment under the tax receivable agreements (23,836) $ (20,318)  
Amounts payable under tax receivable, ending agreements 406,365    
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 TRAs      
Establishment of amounts payable under tax receivable agreements $ 3,825    
LIBOR      
Tax receivable, basis point spread on variable rate (as a percent) 100