Earnings per Share - Calculation of Earnings (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Line Items]
Net income (loss)		$ (41,336)	$ (367,199)	$ 18,641	$ (31,477)	$ (408,535)	$ (12,836)
Net (income) loss allocated to participating restricted stockholders		0		(728)		0	0
Basic and diluted earnings available to common stockholders		$ (41,336)		$ 17,913		$ (408,535)	$ (12,836)
Common shares/units:
Common shares outstanding — basic		37,595		22,267		37,582	22,233
Dilutive effect of potential common shares		0		0		0	0
Common shares outstanding — diluted		37,595		22,267		37,582	22,233
Net earnings per share:
Basic		$ (1.10)		$ 0.80		$ (10.87)	$ (0.58)
Diluted		$ (1.10)		$ 0.80		$ (10.87)	$ (0.58)
Warrants [Member]
Net earnings per share:
Antidilutive warrants	[1]	2,174		2,174		2,174	2,174

[1] Amount represents warrants to purchase common stock that are excluded from the diluted net earnings per share calculations because of their antidilutive effect.