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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Net income attributable to common stockholders — basic and diluted	$ 355	$ 1,147	$ 2,720	$ 2,563	$ (2,291)	$ 2,554	$ 3,205	$ 3,592	$ 6,785	$ 7,060	$ 7,630
Basic (in shares)									29,530	29,209	28,926
Dilutive effect of outstanding stock options and restricted stock grants after application of the treasury stock method (in shares)									348	190	191
Diluted (in shares)									29,878	29,399	29,117
Basic (in dollars per share)	$ 0.01	$ 0.04	$ 0.09	$ 0.09	$ (0.08)	$ 0.09	$ 0.11	$ 0.12	$ 0.23	$ 0.24	$ 0.26
Diluted (in dollars per share)	$ 0.01	$ 0.04	$ 0.09	$ 0.09	$ (0.08)	$ 0.09	$ 0.11	$ 0.12	$ 0.23	$ 0.24	$ 0.26