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Long-Term Incentive Plans - Summary of Information Regarding Board RSUs Granted (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)  
2017 Non-Employee Directors Compensation Plan [Member] | Restricted Stock Units (RSUs) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Outstanding, Number of Units, Beginning Balance     36,955 36,955
Granted, Number of Units [1]       40,060
Forfeited, Number of Units       0
Vested, Number of Units       (46,396)
Outstanding, Number of Units, Ending Balance   30,619   30,619
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance [2]     $ 11.36 $ 11.36
Granted, Weighted-Average Grant Date Fair Value per Unit [2]       6.95
Forfeited, Weighted-Average Grant Date Fair Value per Unit [2]       0
Vested, Weighted-Average Grant Date Fair Value per Unit [2]       9.54
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance [2]   $ 8.35   $ 8.35
[1] The aggregate grant date fair value of Board RSUs issued for the nine months ended September 30, 2019 was $0.3 million based on grant date market price of $6.95 per share.
[2] Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.