Stockholders' Equity (Deficit) - 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
Equity [Abstract]
Net income attributable to common stockholders — basic and diluted	$ (2,291)	$ 2,554	$ 3,205	$ 3,592	$ 4,235	$ 1,162	$ 2,739	$ (506)	$ 7,060	$ 7,630	$ (12,445)
Weighted average number of common shares outstanding (in shares)									29,209	28,926	28,584
Dilutive effect of outstanding stock options and restricted stock grants after application of the treasury stock method (in shares)									190	191	0
Dilutive shares outstanding (in shares)									29,399	29,117	28,584
Basic earnings per share attributable to common stockholders (in dollars per share)	$ (0.08)	$ 0.09	$ 0.11	$ 0.12	$ 0.15	$ 0.04	$ 0.09	$ (0.02)	$ 0.24	$ 0.26	$ (0.44)
Diluted earnings per share attributable to common stockholders (in dollars per share)	$ (0.08)	$ 0.09	$ 0.11	$ 0.12	$ 0.15	$ 0.04	$ 0.09	$ (0.02)	$ 0.24	$ 0.26	$ (0.44)