FAIR VALUE MEASUREMENTS - Changes to Contingent Consideration (Detail) - USD ($) $ 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
Business Combination, Contingent Consideration, Liability [Roll Forward]
Contingent consideration at January 1, 2015				$ 19,941					$ 19,941
Increases due to acquisitions									12,945	$ 17,174	$ 4,371
Decrease due to payments									(1,853)
Changes due to foreign currency fluctuations									(5,003)
Changes in fair value reflected in Selling, general, and administrative expenses	$ 0	$ 0	$ 35	$ (675)	$ (5,405)	$ 0	$ (836)	$ 4,789	(640)	(1,452)
Contingent consideration at December 31, 2015	$ 25,390				$ 19,941				$ 25,390	$ 19,941