GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF CHANGES IN CARRYING VALUE OF GOODWILL BY REPORTABLE SEGMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, gross			$ 1,183,409
Accumulated impairment loss			(362,348)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,985,955	$ 1,801,103	821,061
Acquired during the period (see Note 2)	178,179	1,069,379
Goodwill, Purchase Accounting Adjustments	1,061	27,001
Divested during the period		(98,379)
Foreign Currency Translation	5,612	(17,959)
Goodwill, ending balance	1,985,955	1,801,103
Operating Segments | North America
Goodwill [Line Items]
Goodwill, gross			804,902
Accumulated impairment loss			(4,973)
Goodwill [Roll Forward]
Goodwill, beginning balance	1,967,466	1,782,845	799,929
Acquired during the period (see Note 2)	178,179	1,069,379
Goodwill, Purchase Accounting Adjustments	1,061	27,001
Divested during the period		(98,379)
Foreign Currency Translation	5,381	(15,085)
Goodwill, ending balance	1,967,466	1,782,845
Operating Segments | International and Other
Goodwill [Line Items]
Goodwill, gross			378,507
Accumulated impairment loss			(357,375)
Goodwill [Roll Forward]
Goodwill, beginning balance	18,489	18,258	$ 21,132
Acquired during the period (see Note 2)	0	0
Goodwill, Purchase Accounting Adjustments	0	0
Divested during the period		0
Foreign Currency Translation	231	(2,874)
Goodwill, ending balance	$ 18,489	$ 18,258