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Tax Receivable Agreement Liability (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Tax Receivable Agreement [Line Items]          
Tax receivable agreement, percentage of realized cash saving in tax to pass through 8500.00%   8500.00%    
Tax Receivable Agreement [Roll Forward]          
Payable pursuant to tax receivable agreement   $ 82,291 $ 82,291 $ 93,750 $ 93,750
Additions (reductions) to tax receivable agreement:          
Adjustment to tax receivable agreement liability $ 30,317 2,615 (27,702) $ 0 8,140
Payments under tax receivable agreement     0   (4,279)
Payable pursuant to tax receivable agreement 55,848   55,848   82,291
Less current portion under tax receivable agreement (4,323)   (4,323)   (4,332)
Payable pursuant to tax receivable agreement   $ 77,959 77,959    
Deferred Tax Assets, Investment in Subsidiaries $ 105,886   105,886   109,375
Exchange of LLC Units for Class A Shares          
Additions (reductions) to tax receivable agreement:          
Exchange of LLC Units for Class A Common Stock     1,259   960
Adjustment to tax receivable agreement liability     $ (27,702)   $ (8,140)