Long-Term Incentive Plans - Summary of Information Regarding Restricted Stock Unit Awards (Detail) - Management Incentive Plan [Member]	6 Months Ended
	Jun. 30, 2020 $ / shares shares
TSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance | shares	291,370
Granted, Number of Units | shares	43,250	[1]
Forfeited, Number of Units | shares	(87,314)
Vested, Number of Units | shares	(57,492)
Outstanding, Number of Units, Ending Balance | shares	189,814
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares	$ 5.18	[2]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares	3.10	[1],[2]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares	5.12	[2]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares	5.12	[2]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares	$ 4.75	[2]
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance | shares	305,893
Granted, Number of Units | shares	43,250	[3]
Forfeited, Number of Units | shares	(128,058)
Vested, Number of Units | shares	0
Outstanding, Number of Units, Ending Balance | shares	221,085
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance | $ / shares	$ 2.15	[2]
Granted, Weighted-Average Grant Date Fair Value per Unit | $ / shares	3.03	[2],[3]
Forfeited, Weighted-Average Grant Date Fair Value per Unit | $ / shares	2.11	[2]
Vested, Weighted-Average Grant Date Fair Value per Unit | $ / shares	0	[2]
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance | $ / shares	$ 2.35	[2]

[1] The aggregate grant date fair value of TSUs issued for the six months ended June 30, 2020 was $0.1 million based on a grant date market price of ranging from $0.54 to $6.61 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 six months ended June 30, 2020 was $0.1 million based on a calculated fair value price ranging from $2.46 to $3.66 per share.