INTANGIBLE ASSETS - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,073,969		$ 7,073,969
Accumulated Amortization	(1,222,004)		(1,222,004)
Net Carrying Amount	5,851,965		5,851,965
Amortization of intangible assets	317,219	$ 32,389	555,238	$ 144,324
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,970,884		5,970,884
Accumulated Amortization	(1,002,685)		(1,002,685)		$ (580,276)
Net Carrying Amount	4,968,199		4,968,199		5,345,608
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,066,783		1,066,783
Accumulated Amortization	(213,635)		(213,635)		(83,397)
Net Carrying Amount	853,148		$ 853,148		983,386
Remaining amortization period			3 years
Remaining amortization period, in-use period			1 year
Remaining amortization period, defensive asset			2 years
2017 Amortization expense remaining	545,805		$ 545,805
Amortization of intangible assets			122,818
Amortization expense, 2018	355,006		355,006
Amortization expense, 2019	46,627		46,627
Amortization expense, 2020	18,140		18,140
Other amortizable intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	36,302		36,302
Accumulated Amortization	(5,684)		(5,684)		(3,093)
Net Carrying Amount	$ 30,618		$ 30,618		$ 23,650
Minimum | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			8 years
Minimum | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			2 years
Minimum | Other amortizable intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			1 year
Maximum | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			18 years
Maximum | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			4 years
Maximum | Other amortizable intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life			15 years