Net Income (Loss) Per Share - Summary of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss	$ (18,600)	$ (5,983)
Weighted average shares outstanding (in shares)	41,972	27,597
Effect of dilutive stock options (in shares)	0	0
Diluted shares outstanding (in shares)	41,972	27,597
Basic - net loss per share (in dollars per share)	$ (0.44)	$ (0.22)
Diluted - net loss per share (in dollars per share)	(0.44)	(0.22)
Cash dividends declared per share (in dollars per share)	$ 0.07	$ 0.07