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Income Taxes and Related Payments - Additional information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
TRA
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Approximate percentage of earnings not subject to income taxes     31.00%    
Effective tax rate     7.30% 15.70%  
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 $ 2,000   $ 2,000   $ 0
Deferred Tax Asset - Amortizable basis          
Deferred tax assets, beginning     404,715    
2019 Holdings Common Unit Exchanges     11,542    
Amortization     (23,856)    
Change in estimate     21,873    
Deferred tax assets, ending 414,274   414,274    
Amounts payable under tax receivable agreements          
Amounts payable under tax receivable, beginning agreements     369,355    
2019 Holdings Common Unit Exchanges     29,368 $ 19,683  
Payments under TRA     (24,998) (36,111)  
Change in estimate 19,557 $ (251) 19,557 $ (251)  
Amounts payable under tax receivable, ending agreements 373,725   373,725    
Unrecognized tax benefits that would impact effective tax rate 1,600   1,600    
Unrecognized tax benefits, income tax penalties accrued 300   300    
Unrecognized tax benefits $ 2,000   $ 2,000   $ 0
Statutory tax rate     21.00%    
Capital Unit          
Amounts payable under tax receivable agreements          
2019 Holdings Common Unit Exchanges     $ 9,811    
LIBOR          
Tax receivable, basis point spread on variable rate (as a percent)     100