GOODWILL AND INTANGIBLE ASSETS - SUMMARY OF CHANGES IN CARRYING VALUE OF GOODWILL BY REPORTABLE SEGMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, gross			$ 874,501
Accumulated impairment loss			(81,546)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 684,252	$ 792,955
Acquired during the period (see Note 2)	128,110	147,089
Impairment		(280,802)
Purchase price allocation adjustments		48,023
Accumulated impairment loss	(18)	(23,013)
Goodwill, ending balance	812,344	684,252	792,955
Operating Segments | North America
Goodwill [Line Items]
Goodwill, gross			538,322
Accumulated impairment loss			(4,973)
Goodwill [Roll Forward]
Goodwill, beginning balance	662,083	533,349
Acquired during the period (see Note 2)	128,110	147,089
Impairment		0
Purchase price allocation adjustments		1,820
Accumulated impairment loss	1,997	(20,175)
Goodwill, ending balance	792,190	662,083	533,349
Operating Segments | International and Other
Goodwill [Line Items]
Goodwill, gross			336,179
Accumulated impairment loss			(76,573)
Goodwill [Roll Forward]
Goodwill, beginning balance	22,169	259,606
Acquired during the period (see Note 2)	0	0
Impairment		(280,802)
Purchase price allocation adjustments		46,203
Accumulated impairment loss	(2,015)	(2,838)
Goodwill, ending balance	$ 20,154	$ 22,169	$ 259,606