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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, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Income (loss) from continuing operations	$ (5,983)	$ 1,893
Income from discontinued operations, net of tax		5,518
Net income (loss)	$ (5,983)	$ 7,411
Weighted average shares outstanding	27,597	27,303
Effect of dilutive stock options		331
Diluted shares outstanding	27,597	27,634
Basic income (loss) from continuing operations per share	$ (0.22)	$ 0.07
Basic income from discontinued operations per share		0.20
Basic net income (loss) per share	(0.22)	0.27
Diluted income (loss) from continuing operations per share	(0.22)	0.07
Diluted income from discontinued operations per share		0.20
Diluted net income (loss) per share	$ (0.22)	$ 0.27

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