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Equity-based Awards - Summary of Information Regarding Restricted Common Unit Awards (Detail) - Restricted Common Units [Member] - Predecessor [Member] - $ / shares
4 Months Ended 12 Months Ended
May 04, 2017
Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Number of Units, Beginning Balance   432,160
Granted, Number of Units   0
Forfeited, Number of Units   (12,952)
Vested, Number of Units   (43,045)
Cancelled, Number of Units (376,163)  
Outstanding, Number of Units, Ending Balance 0  
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance [1]   $ 15.00
Granted, Weighted-Average Grant Date Fair Value per Unit [1]   0
Forfeited, Weighted-Average Grant Date Fair Value per Unit [1]   9.51
Vested, Weighted-Average Grant Date Fair Value per Unit [1]   10.40
Cancelled, Weighted-Average Grant Date Fair Value per Unit [1] $ 15.72 $ 0
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance [1] $ 0  
[1] Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.