GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Beginning Balance	$ 2,418,832	$ 2,231,582
Goodwill acquired during the year	100,319	258,017
Purchase accounting allocation adjustments	(14,926)	(22,420)
Goodwill other changes	(440)
Changes due to foreign currency fluctuations	(56,331)	(48,347)
Ending Balance	2,447,454	2,418,832
United States
Goodwill [Roll Forward]
Beginning Balance	1,836,402	1,673,810
Goodwill acquired during the year	71,119	169,754
Purchase accounting allocation adjustments	(14,514)	(4,825)
Goodwill other changes	0
Changes due to foreign currency fluctuations	(4,210)	(2,337)
Ending Balance	1,888,797	1,836,402
International
Goodwill [Roll Forward]
Beginning Balance	582,430	557,772
Goodwill acquired during the year	29,200	88,263
Purchase accounting allocation adjustments	(412)	(17,595)
Goodwill other changes	(440)
Changes due to foreign currency fluctuations	(52,121)	(46,010)
Ending Balance	$ 558,657	$ 582,430