ACQUISITIONS - Aggregate Purchase Price Paid for Acquisitions and Other Adjustments to Consideration (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Cash	$ 42,097	$ 61,766
Promissory notes	75
Business Acquisitions in 2016
Business Acquisition [Line Items]
Cash	32,651
Promissory notes	23,238
Deferred consideration	1,545
Contingent consideration	75
Total purchase price	57,509
Business Acquisitions in Year 2015
Business Acquisition [Line Items]
Cash	9,446
Promissory notes reduction resulting from adjustment	(1,789)
Total purchase price	$ 7,657