GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Beginning Balance	$ 3,758,177	$ 2,418,832
Goodwill acquired during year	52,769	1,450,950
Purchase accounting adjustments	(161,189)	(28,277)
Other changes		(440)
Goodwill write-offs related to disposition and assets held for sale	(7,486)
Changes due to foreign currency fluctuations	(51,251)	(82,888)
Ending Balance	3,591,020	3,758,177
Domestic and Canada RCS
Goodwill [Roll Forward]
Beginning Balance	2,842,711	1,638,529
Goodwill acquired during year	41,517	1,231,219
Purchase accounting adjustments	(77,247)	(8,072)
Other changes		0
Goodwill write-offs related to disposition and assets held for sale	0
Changes due to foreign currency fluctuations	4,820	(18,965)
Ending Balance	2,811,801	2,842,711
International Regulated and Compliance Services
Goodwill [Roll Forward]
Beginning Balance	632,491	521,338
Goodwill acquired during year	8,381	192,737
Purchase accounting adjustments	(78,894)	(17,221)
Other changes		(440)
Goodwill write-offs related to disposition and assets held for sale	(7,486)
Changes due to foreign currency fluctuations	(56,071)	(63,923)
Ending Balance	498,421	632,491
Other
Goodwill [Roll Forward]
Beginning Balance	282,975	258,965
Goodwill acquired during year	2,871	26,994
Purchase accounting adjustments	(5,048)	(2,984)
Other changes		0
Goodwill write-offs related to disposition and assets held for sale	0
Changes due to foreign currency fluctuations	0	0
Ending Balance	$ 280,798	$ 282,975