GOODWILL AND OTHER INTANGIBLE ASSETS - Rollforward of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite-lived and Indefinite-lived Intangible Assets [Roll Forward]
Beginning of period			$ 1,842,561	$ 909,645	$ 909,645
Intangible assets acquired during the year			23,235		1,016,775
Valuation adjustments for prior year acquisitions			178,621		35,241
Impairments during the year			(4)		(4,177)
Amortization during the year	$ (33,128)	$ (9,239)	(102,311)	$ (26,957)	(45,498)
Changes due to foreign currency fluctuations			(14,993)		(69,425)
End of period	$ 1,927,109		$ 1,927,109		$ 1,842,561