Net Income (Loss) Per Share - Calculations of Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic:
Net income (loss)	$ (24,085)	$ (11,628)	$ (561)	$ (45,253)
Weighted average common shares outstanding (in shares)	20,387	20,919	20,390	20,892
Net income (loss) per share (in dollars per share)	$ (1.18)	$ (0.56)	$ (0.03)	$ (2.17)
Diluted:
Weighted average common shares outstanding (in shares)	20,387	20,919	20,390	20,892
Net income (loss) per share (in dollars per share)	$ (1.18)	$ (0.56)	$ (0.03)	$ (2.17)