ACQUISITIONS - Aggregate Purchase Price Paid for Acquisitions and Other Adjustments to Consideration (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Business Combinations [Abstract]
Cash	$ 61,766	$ 304,832
Promissory notes	35,986	63,022
Deferred consideration	974	5,032
Contingent consideration	10,867	15,810
Total purchase price	$ 109,593	$ 388,696