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Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Detail)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Management Incentive Plan [Member] | TSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance | shares 115,797
Granted, Number of Units | shares 0
Forfeited, Number of Units | shares (622)
Vested, Number of Units | shares (7,870)
Outstanding, Number of Units, Ending Balance | shares 107,305
Restricted Stock Units (RSUs) [Member] | TSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 4.47 [1]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [1]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 5.12 [1]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 6.27 [1]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 4.33 [1]
Restricted Stock Units (RSUs) [Member] | 2017 Non-Employee Directors Compensation Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Outstanding, Number of Units, Beginning Balance | shares 8,898
Granted, Number of Units | shares 0
Forfeited, Number of Units | shares 0
Vested, Number of Units | shares 0
Outstanding, Number of Units, Ending Balance | shares 8,898
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares $ 5.12 [1]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [1]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [1]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares 0 [1]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares $ 5.12 [1]
[1]

Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.