Net (Loss) Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (6,386)	$ 4,856	$ (10,061)	$ 21,217
Basic weighted-average common shares outstanding (in shares)	66,820	39,123	49,858	38,901
Effect of dilutive stock options (in shares)	0	85	0	82
Effect of dilutive restricted stock (in shares)	0	1,078	0	1,140
Diluted weighted-average common shares outstanding (in shares)	66,820	40,286	49,858	40,123
Basic (loss) income per common share (in dollars per share)	$ (0.10)	$ 0.12	$ (0.20)	$ 0.55
Diluted (loss) income per common share (in dollars per share)	$ (0.10)	$ 0.12	$ (0.20)	$ 0.53
Antidilutive securities excluded from diluted net income per common share (in shares)	2,588	48	1,657	44