Debt - Summary of Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017
Debt Instrument [Line Items]
Term note payable—domestic, net of discounts	$ 2,959,854		$ 2,993,667
Other debt	43,009		43,736
Total notes payable and other obligations	3,660,445		3,707,616
Securitization facility	829,000	[1]	811,000
Total notes payable, credit agreements and Securitization Facility	4,489,445		4,518,616
Current portion	1,621,913		1,616,512
Long-term portion	2,867,532	[1]	2,902,104
Revolving line of credit A Facility—domestic
Debt Instrument [Line Items]
Revolving line of credit	365,000		635,000
Revolving line of credit B Facility—foreign
Debt Instrument [Line Items]
Revolving line of credit	280,258		28,334
Revolving line of credit B Facility—swing line
Debt Instrument [Line Items]
Revolving line of credit	$ 12,324		$ 6,879

[1] Reflects January 1, 2018 adoption of Accounting Standards Update 2014-09, "Revenue from Contracts with Customers (Topic 606)" and related cost capitalization guidance using the modified retrospective transition method. The adoption of Topic 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effective 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 Topic 606. See footnote 1.