Net (Loss) Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net (loss) income	$ (7,012)	$ 6,412	$ (3,675)	$ 16,361
Basic weighted-average common shares outstanding (in shares)	43,135	38,972	41,284	38,789
Effect of dilutive stock options (in shares)	0	98	0	80
Effect of dilutive restricted stock (in shares)	0	1,169	0	1,195
Diluted weighted-average common shares outstanding (in shares)	43,135	40,239	41,284	40,064
Basic (loss) income per common share (in dollars per share)	$ (0.16)	$ 0.16	$ (0.09)	$ 0.42
Diluted (loss) income per common share (in dollars per share)	$ (0.16)	$ 0.16	$ (0.09)	$ 0.41
Antidilutive securities excluded from diluted net income per common share (in shares)	1,649	31	1,517	55