Segments - Schedule of Company's Segment Results (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues, net	$ 619,586	[1]	$ 577,877	$ 1,790,070	[1]	$ 1,639,547
Operating income	281,090	[1]	232,637	805,961	[1]	643,748
Depreciation and amortization	67,267	[1]	69,156	207,379	[1]	198,731
Capital expenditures	21,698		16,859	56,312	[2]	49,459	[2]
North America
Segment Reporting Information [Line Items]
Revenues, net	412,816		368,006	1,148,034		1,040,949
Operating income	177,769		138,480	495,095		394,378
Depreciation and amortization	39,049		38,399	116,041		104,960
Capital expenditures	12,604		9,167	32,700		30,901
International
Segment Reporting Information [Line Items]
Revenues, net	206,770		209,871	642,036		598,598
Operating income	103,321		94,157	310,866		249,370
Depreciation and amortization	28,218		30,757	91,338		93,771
Capital expenditures	$ 9,094		$ 7,692	$ 23,612		$ 18,558

[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 annual report on Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect the impact of ASC 606. See footnote 1, "Summary of Significant Accounting Policies", in the accompanying notes to the unaudited consolidated financial statements.

[2] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, "Statement of Cash Flows (Topic 230)", which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.