Goodwill and Other Intangible Assets - Summary of Changes in Goodwill by Reportable Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,552,725us-gaap_Goodwill	$ 926,609us-gaap_Goodwill
Acquisitions	2,302,575us-gaap_GoodwillAcquiredDuringPeriod	646,556us-gaap_GoodwillAcquiredDuringPeriod
Purchase Price Adjustments	(5,195)	80
Foreign Currency	(38,243)us-gaap_GoodwillTranslationAdjustments	(20,520)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance	3,811,862us-gaap_Goodwill	1,552,725us-gaap_Goodwill
North America [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	366,594	276,714
Acquisitions	2,290,657	89,880
Purchase Price Adjustments	2,166
Goodwill, Ending Balance	2,659,417	366,594
International [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,186,131	649,895
Acquisitions	11,918	556,676
Purchase Price Adjustments	(7,361)	80
Foreign Currency	(38,243)	(20,520)
Goodwill, Ending Balance	$ 1,152,445	$ 1,186,131

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

-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

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+ References

Reference 1: 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

Reference 2: 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=34752592&loc=d3e961-128460

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