EARNINGS PER SHARE (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Loss before income taxes	$ (21,799)	$ (6,849)	$ (12,969)
Denominator:
Unvested restricted stock (in shares)	(38)	(88)	(115)
Effect of weighted average shares outstanding (in shares)	(402)	(239)	(295)
Weighted average common shares outstanding (in shares)	41,846	41,233	40,642
Antidilutive potentially issuable shares (in shares)	2,219	2,442	2,259
Class A Common Stock
Denominator:
Common stock, outstanding shares (in shares)	41,298	40,572	40,064
Class B Common Stock
Denominator:
Common stock, outstanding shares (in shares)	988	988	988