Net (Loss) Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net loss	$ (26,657)	$ (7,012)	$ (17,649)	$ (3,675)
Basic weighted-average common shares outstanding (in shares)	67,505	43,135	67,300	41,284
Effect of dilutive stock options (in shares)	0	0	0	0
Effect of dilutive restricted stock (in shares)	0	0	0	0
Diluted weighted-average common shares outstanding (in shares)	67,505	43,135	67,300	41,284
Basic loss per common share (in dollars per share)	$ (0.39)	$ (0.16)	$ (0.26)	$ (0.09)
Diluted loss per common share (in dollars per share)	$ (0.39)	$ (0.16)	$ (0.26)	$ (0.09)
Antidilutive securities excluded from diluted net income per common share (in shares)	3,173	1,649	3,173	1,517