Debt - Summary of Debt Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Term note payable—domestic, net of discounts	$ 3,027,472	$ 2,639,279
Other debt	41,771	12,934
Total notes payable and other obligations	3,742,483	3,267,233
Securitization facility	794,000	591,000
Total notes payable, credit agreements and Securitization Facility	4,536,483	3,858,233
Current portion	1,602,507	1,336,506
Long-term portion	2,933,976	2,521,727
Revolving line of credit A Facility—domestic
Debt Instrument [Line Items]
Revolving line of credit	595,000	465,000
Revolving line of credit A Facility—foreign
Debt Instrument [Line Items]
Revolving line of credit	38,047	123,412
Revolving line of credit A Facility—swing line
Debt Instrument [Line Items]
Revolving line of credit	$ 40,193	$ 26,608