Goodwill and Other Intangible Assets - Summary of Changes in Goodwill by Reportable Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 3,713,182	$ 1,535,672
Acquisitions	10,082	2,302,575
Purchase Price Adjustments	(21,245)	(5,195)
Foreign Currency	(155,985)	(119,870)
Goodwill, Ending Balance	3,546,034	3,713,182
North America [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	2,659,417	366,594
Acquisitions		2,290,657
Purchase Price Adjustments	(19,008)	2,166
Goodwill, Ending Balance	2,640,409	2,659,417
International [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,053,765	1,169,078
Acquisitions	10,082	11,918
Purchase Price Adjustments	(2,237)	(7,361)
Foreign Currency	(155,985)	(119,870)
Goodwill, Ending Balance	$ 905,625	$ 1,053,765