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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
TRA
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Approximate percentage of earnings not subject to income taxes 25.00%    
Effective tax rate 18.30% 16.00%  
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 $ 1,500   $ 2,000
Deferred Tax Asset - Amortizable basis      
Deferred tax assets, beginning 408,140    
2020 Holdings Common Unit Exchanges 22,235    
Amortization (17,586)    
Deferred tax assets, ending 434,213    
Amounts payable under tax receivable agreements      
Amounts payable under tax receivable, beginning agreements 375,324    
Establishment of amounts payable under tax receivable agreements 37,110 $ 8,894  
Payment under the tax receivable agreements (20,318) $ (19,009)  
Amounts payable under tax receivable, ending agreements 392,116    
Unrecognized tax benefits, income tax penalties accrued 300    
Unrecognized tax benefits $ 1,500   $ 2,000
Statutory tax rate 21.00%    
Capital Unit      
Amounts payable under tax receivable agreements      
Establishment of amounts payable under tax receivable agreements $ 18,899    
LIBOR      
Tax receivable, basis point spread on variable rate (as a percent) 100