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Long-Term Incentive Plans - Summary of Information Regarding Board RSUs Granted (Detail)
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Vested, Number of Units (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 39,604
Granted, Number of Units 42,933 [1]
Forfeited, Number of Units 0
Vested, Number of Units (21,617)
Outstanding, Number of Units, Ending Balance 60,920
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 11.36 [2]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 6.95 [2]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [2]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 11.57 [2]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 8.18 [2]
[1] The aggregate grant date fair value of Board RSUs issued for the six months ended June 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.