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Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Detail) - $ / shares
1 Months Ended 2 Months Ended 6 Months Ended 9 Months Ended
Aug. 05, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vested, Number of Units (38,181) (602,053) (412,938)  
PSUs [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Outstanding, Number of Units, Ending Balance   25,662   25,662
Management Incentive Plan [Member] | TSUs [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Outstanding, Number of Units, Beginning Balance     557,963 557,963
Granted, Number of Units [1]       280,416
Forfeited, Number of Units       (35,596)
Vested, Number of Units       (444,142)
Outstanding, Number of Units, Ending Balance   358,641   358,641
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance [2]     $ 11.41 $ 11.41
Granted, Weighted-Average Grant Date Fair Value per Unit [2]       6.80
Forfeited, Weighted-Average Grant Date Fair Value per Unit [2]       11.13
Vested, Weighted-Average Grant Date Fair Value per Unit [2]       9.01
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance [2]   $ 10.71   $ 10.71
Management Incentive Plan [Member] | PSUs [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Outstanding, Number of Units, Beginning Balance     367,141 367,141
Granted, Number of Units [3]       16,562
Forfeited, Number of Units       (44,552)
Vested, Number of Units       0
Outstanding, Number of Units, Ending Balance   339,151   339,151
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance [2]     $ 8.14 $ 8.14
Granted, Weighted-Average Grant Date Fair Value per Unit [2],[3]       4.06
Forfeited, Weighted-Average Grant Date Fair Value per Unit [2]       7.59
Vested, Weighted-Average Grant Date Fair Value per Unit [2]       0
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance [2]   $ 8.01   $ 8.01
[1] The aggregate grant date fair value of TSUs issued for the nine months ended September 30, 2019 was $1.9 million based on a grant date market price ranging from $4.48 to $8.70 per share.
[2] Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.
[3] The aggregate grant date fair value of PSUs issued for the nine months ended September 30, 2019 was less than $0.1 million based on a calculated fair value price ranging from $1.64 to $6.76 per share.