Debt - Summary of Debt Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Term note payable—domestic, net of discounts	$ 2,574,080	$ 2,639,279
Other debt	16,564	12,934
Total notes payable and other obligations	3,097,065	3,267,233
Securitization facility	741,000	591,000
Total notes payable, credit agreements and Securitization Facility	3,838,065	3,858,233
Current portion	1,443,444	1,336,506
Long-term portion	2,394,621	2,521,727
Revolving line of credit A Facility—domestic
Debt Instrument [Line Items]
Revolving line of credit	400,000	465,000
Revolving line of credit A Facility—foreign
Debt Instrument [Line Items]
Revolving line of credit	67,614	123,412
Revolving line of credit A Facility—swing line
Debt Instrument [Line Items]
Revolving line of credit	$ 38,807	$ 26,608