FAIR VALUE MEASUREMENTS - Changes to Contingent Consideration (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Combination, Contingent Consideration, Liability [Roll Forward]
Contingent consideration at January 1, 2014				$ 12,527					$ 12,527
Increases due to acquisitions									17,174	4,371	9,190
Decrease due to change in noncontrolling interests									(4,379)
Decrease due to payments									(2,737)
Changes due to foreign currency fluctuations									(1,192)
Changes in fair value reflected in Selling, general, and administrative expenses	(5,405)	0	(836)	4,789	(1,971)	(185)	(122)	0	(1,452)	(2,278)	752
Contingent consideration at December 31, 2014	$ 19,941				$ 12,527				$ 19,941	$ 12,527