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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 06, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]          
Effective tax rate   6.50% 12.60%    
Unrecognized tax positions         $ 0
Amount payable to related parties   $ 34,335,000   $ 34,133,000  
TRA Recipients | Tax Receivable Agreement          
Income Tax Contingency [Line Items]          
Percentage of cash savings payable 85.00%        
Amount payable to related parties   34,335,000   $ 34,133,000  
Amounts paid to TRA recipients   $ 0