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Tax Receivable Agreement Liability - Schedule of Tax Agreement Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Tax Receivable Agreement [Roll Forward]        
Payable pursuant to tax receivable agreement   $ 55,046 $ 82,291 $ 82,291
Additions (reductions) to tax receivable agreement:        
Adjustment for change in estimated tax rate $ 30,317 0 $ (27,702)  
Payments under tax receivable agreement   0   (4,293)
Payable pursuant to tax receivable agreement   57,599   55,046
Less current portion under tax receivable agreement   (3,932)   (3,932)
Payable pursuant to tax receivable agreement, less current portion   53,667   51,114
Exchange of LLC Units for Class A Shares        
Additions (reductions) to tax receivable agreement:        
Exchange of LLC Units for Class A Common Stock   2,553   1,685
Adjustment for change in estimated tax rate   $ 0   $ (24,637)