Goodwill and Other Intangible Assets - Summary of Changes in Goodwill by Reportable Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018
Goodwill [Roll Forward]
Beginning Balance of Goodwill	$ 4,542,074		$ 4,715,823
Acquisitions	288,397		16,184
Acquisition Accounting Adjustments	2,914		4,056
Foreign Currency	(338)		(193,989)
Ending Balance of Goodwill	4,833,047	[1]	4,542,074
North America
Goodwill [Roll Forward]
Beginning Balance of Goodwill	3,087,875		3,084,123
Acquisitions	268,866		16,184
Acquisition Accounting Adjustments	2,914		4,036
Foreign Currency	9,518		(16,468)
Ending Balance of Goodwill	3,369,173		3,087,875
International
Goodwill [Roll Forward]
Beginning Balance of Goodwill	1,454,199		1,631,700
Acquisitions	19,531		0
Acquisition Accounting Adjustments	0		20
Foreign Currency	(9,856)		(177,521)
Ending Balance of Goodwill	$ 1,463,874		$ 1,454,199

[1] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using a modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 14.