STOCK-BASED COMPENSATION - Schedule of Information Regarding Restricted Stock Units Outstanding (Detail) - RSUs outstanding - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, number of Shares	1,090,752	508,880	427,192	487,423
RSUs vested and expected to vest using estimated forfeiture rates, number of shares	959,209	414,847	349,759
RSUs outstanding, weighted average remaining contractual life (years)	8 months 1 day	1 year 3 months 18 days	11 months 4 days
RSUs vested and expected to vest using estimated forfeiture rates, weighted average remaining contractual life (years)	6 months 21 days	1 year 1 month 27 days	9 months 18 days
RSUs outstanding, aggregate intrinsic value	$ 9.8	$ 3.6	$ 4.5
RSUs vested and expected to vest using estimated forfeiture rates, aggregate intrinsic value	8.6	2.9	3.7
RSUs outstanding, fair value	$ 9.8	$ 3.6	$ 4.5