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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
TRA
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Approximate percentage of earnings not subject to income taxes 26.00%    
Effective tax rate 17.80% 15.90%  
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 14,873    
Amortization (8,687)    
Deferred tax assets, ending 435,750    
Amounts payable under tax receivable agreements      
Amounts payable under tax receivable, beginning agreements 375,324    
Establishment of amounts payable under tax receivable agreements 30,853 $ 5,389  
Amounts payable under tax receivable, ending agreements 406,177    
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 $ 12,642    
LIBOR      
Tax receivable, basis point spread on variable rate (as a percent) 100