Income Taxes - Components of Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current income taxes, Federal	$ 165,303		$ 303,514	$ 147,406
Current income taxes, State	26,036		19,234	10,725
Current income taxes, Foreign	95,053		78,354	61,084
Total current	286,392		401,102	219,215
Deferred income taxes, Federal	(19,688)		(255,188)	(18,723)
Deferred income taxes, State	8,727		276	1,608
Deferred income taxes, Foreign	8,211		7,200	(11,566)
Total deferred	(2,750)		(247,712)	(28,681)
Total provision	$ 283,642	[1]	$ 153,390	$ 190,534

[1] Reflects the impact of the Company's adoption of Accounting Standards Update 2014-09, Revenue from Contracts with Customers (Topic 606) ("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.