Goodwill and Other Intangible Assets - Summary of Changes in Goodwill by Reportable Business Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 3,811,862
Acquisitions	(5,569)
Foreign Currency	(39,222)
Goodwill, Ending Balance	3,767,071
North America [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	2,659,417
Acquisitions	(5,569)
Goodwill, Ending Balance	2,653,848
International [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,152,445
Foreign Currency	(39,222)
Goodwill, Ending Balance	$ 1,113,223