ACQUISITIONS - Aggregate Purchase Price Paid for Acquisitions and Other Adjustments to Consideration (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Cash	$ 97,098	$ 328,811
Promissory notes	55,793	78,325
Deferred consideration	3,167	6,124
Contingent consideration	12,945	16,495
Total purchase price	$ 169,003	$ 429,755