ACQUISITIONS AND DIVESTITURES - Aggregate Purchase Price Paid for Acquisitions and Other Adjustments to Consideration (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Cash	$ 374,321	$ 161,936	$ 224,367
Promissory notes	125,229	64,581	70,670
Deferred consideration	3,535	31,149	17,681
Contingent consideration	17,174	4,371	9,190
Total purchase price	$ 520,259	$ 262,037	$ 321,908