Components of Numerator and Denominator for Computation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Income (loss) from continuing operations									$ 4,954	$ (31,534)	$ (54,250)
Less: Income attributable to noncontrolling interest in subsidiary									536	249	0
Income (loss) from continuing operations attributable to common shareholders									4,418	(31,783)	(54,250)
Income from discontinued operations, net of income taxes									0	0	2,281
Net income (loss) attributable to common shareholders	$ (6,098)	$ 5,009	$ 2,573	$ 2,934	$ (20,218)	$ (7,602)	$ (3,181)	$ (782)	$ 4,418	$ (31,783)	$ (51,969)
Basic weighted average common shares (in shares)									31,514	31,190	31,009
Share-based awards (in shares)									648	0	0
Diluted weighted average common shares outstanding (in shares)									32,162	31,190	31,009
Basic and diluted income (loss) per share attributable to common shareholders
Continuing operations (usd per share)									$ 0.14	$ (1.02)	$ (1.75)
Discontinued operations (usd per share)									0.00	0.00	0.07
Net (loss) income (usd per share)					$ (0.65)	$ (0.24)	$ (0.10)	$ (0.03)	$ 0.14	$ (1.02)	$ (1.68)