GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning Balance	$ 3,591,020	$ 3,758,177
Goodwill acquired during the period	19,107	52,769
Purchase accounting adjustments	(216)	(161,189)
Other changes	20	(7,486)
Changes due to foreign currency fluctuations	12,862	(51,251)
Ending Balance	3,622,793	3,591,020
Domestic and Canada RCS
Goodwill [Roll Forward]
Beginning Balance	2,811,801	2,842,711
Goodwill acquired during the period	11,782	41,517
Purchase accounting adjustments	(168)	(77,247)
Other changes	0	0
Changes due to foreign currency fluctuations	1,278	4,820
Ending Balance	2,824,693	2,811,801
International Regulated and Compliance Services
Goodwill [Roll Forward]
Beginning Balance	498,421	632,491
Goodwill acquired during the period	2,706	8,381
Purchase accounting adjustments	(76)	(78,894)
Other changes	20	(7,486)
Changes due to foreign currency fluctuations	11,584	(56,071)
Ending Balance	512,655	498,421
Other
Goodwill [Roll Forward]
Beginning Balance	280,798	282,975
Goodwill acquired during the period	4,619	2,871
Purchase accounting adjustments	28	(5,048)
Other changes	0	0
Changes due to foreign currency fluctuations	0	0
Ending Balance	$ 285,445	$ 280,798

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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