Debt - Summary of Debt Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Term note payable—domestic, net of discounts	$ 2,106,840	$ 2,157,376
Other debt	2,236	3,624
Total notes payable and other obligations	2,119,076	2,321,000
Securitization facility	713,000	614,000
Total notes payable, credit agreements and Securitization Facility	2,832,076	2,935,000
Current portion	824,158	875,100
Long-term portion	2,007,918	2,059,900
Domestic Line of Credit [Member]
Debt Instrument [Line Items]
Revolving line of credit	10,000	160,000
Foreign Revolving Line of Credit Facility A [Member]
Debt Instrument [Line Items]
Revolving line of credit	$ 0	$ 0