Goodwill and Other Intangible Assets - Summary of Changes in Goodwill by Reportable Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017
Goodwill [Roll Forward]
Beginning Balance of Goodwill	$ 4,715,823		$ 4,195,150
Acquisitions	16,184		556,102
Dispositions			(92,046)
Acquisition Accounting Adjustments	4,056		3,752
Foreign Currency	(193,989)		52,865
Ending Balance of Goodwill	4,542,074	[1]	4,715,823
North America
Goodwill [Roll Forward]
Beginning Balance of Goodwill	3,084,123		2,640,409
Acquisitions	16,184		534,777
Dispositions			(92,046)
Acquisition Accounting Adjustments	4,036		0
Foreign Currency	(16,468)		983
Ending Balance of Goodwill	3,087,875		3,084,123
International
Goodwill [Roll Forward]
Beginning Balance of Goodwill	1,631,700		1,554,741
Acquisitions	0		21,325
Dispositions			0
Acquisition Accounting Adjustments	20		3,752
Foreign Currency	(177,521)		51,882
Ending Balance of Goodwill	$ 1,454,199		$ 1,631,700

[1] Reflects the impact of the Company's adoption of ASC 606 and related cost capitalization guidance, which was adopted by the Company on January 1, 2018 using the modified retrospective transition method. The adoption of ASC 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effect of applying the standard, which included costs incurred to obtain a contract, as well as presentation changes in our statements of income, including the classification of certain amounts previously classified as merchant commissions and processing expense net with revenues. As a result of the application of the modified retrospective transition method, the Company's prior period results within its Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect ASC 606.