FAIR VALUE MEASUREMENTS - Level 3 Contingent Consideration (Detail) - Contingent Consideration - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 3,739	$ 3,638
Accretion of liability	222	366
Foreign currency effects	203	80
Payment	(1,278)	(4,000)
Revaluation	(1,174)	2,184
Acquisitions	0	1,471
Ending balance	$ 1,712	$ 3,739