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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
TRA
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Statutory tax rate     21.00%    
Approximate percentage of earnings not subject to income taxes     20.00%    
Effective tax rate     18.80% 18.10%  
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    
Deferred Tax Asset - Amortizable Basis          
Deferred tax assets, beginning     $ 446,954    
2021 Holdings Common Unit Exchanges     11,360    
Amortization     (29,378)    
Change in estimate     (9)    
Deferred tax assets, ending $ 445,289   445,289    
Amounts Payable Under TRAs          
Amounts payable under tax receivable, beginning agreements     412,468    
Establishment of amounts payable under tax receivable agreements     23,206 $ 37,602  
Payment under the tax receivable agreements     (31,250) (26,943)  
Change in estimate (358) $ (238) (358) $ (238)  
Amounts payable under tax receivable, ending agreements 404,424   404,424    
Unrecognized tax benefits 1,300   1,300   $ 1,300
Unrecognized tax benefits, income tax penalties accrued $ 200   200   $ 200
Follow On Offering          
Deferred Tax Asset - Amortizable Basis          
2021 Holdings Common Unit Exchanges     16,362    
Amounts Payable Under TRAs          
Establishment of amounts payable under tax receivable agreements     13,908    
Capital Unit          
Amounts Payable Under TRAs          
Establishment of amounts payable under tax receivable agreements     $ 9,656    
LIBOR          
Tax receivable, basis point spread on variable rate (as a percent)     100