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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
TRA
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Statutory tax rate 21.00%    
Approximate percentage of earnings not subject to income taxes 31.00%    
Effective tax rate 16.00% 14.80%  
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 years    
Unrecognized tax benefits $ 0   $ 0
Deferred Tax Asset [Roll Forward]      
Deferred tax assets, beginning 404,715    
2019 Holdings Common Unit Exchanges 10,464    
Amortization (15,480)    
Deferred tax assets, ending 399,699    
Tax Receivable Agreements [Roll Forward]      
Amounts payable under tax receivable, beginning agreements 369,355    
Establishment of amounts payable under tax receivable agreements 8,894 $ 19,342  
Payments under TRA (19,009) $ (27,251)  
Amounts payable under tax receivable, ending agreements 359,240    
Capital Unit      
Tax Receivable Agreements [Roll Forward]      
Establishment of amounts payable under tax receivable agreements $ 8,894    
LIBOR      
Tax receivable, basis point spread on variable rate (as a percent) 100