GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning Balance	$ 3,758,177	$ 2,418,832
Goodwill acquired during the year, net	17,840	1,450,950
Purchase accounting allocation adjustments	7,679	(28,277)
Goodwill other changes		(440)
Changes due to foreign currency fluctuations	6,320	(82,888)
Ending Balance	3,790,016	3,758,177
United States
Goodwill [Roll Forward]
Beginning Balance	2,972,275	1,838,739
Goodwill acquired during the year, net	17,390	1,177,431
Purchase accounting allocation adjustments	6,305	(43,895)
Ending Balance	2,995,970	2,972,275
International
Goodwill [Roll Forward]
Beginning Balance	785,902	580,093
Goodwill acquired during the year, net	450	273,519
Purchase accounting allocation adjustments	1,374	15,618
Goodwill other changes		(440)
Changes due to foreign currency fluctuations	6,320	(82,888)
Ending Balance	$ 794,046	$ 785,902