Debt - Summary of Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019		Dec. 31, 2018
Debt Instrument [Line Items]
Other debt	$ 30,084		$ 37,902
Total notes payable and other obligations	3,573,569		3,933,047
Securitization facility	942,000	[1]	886,000
Total notes payable, credit agreements and Securitization Facility	4,515,569		4,819,047
Current portion	1,807,318		2,070,616
Long-term portion	2,708,251	[1]	2,748,431
Term Loan A
Debt Instrument [Line Items]
Term note payable—domestic, net of discounts	2,484,495		2,515,519
Term Loan B
Debt Instrument [Line Items]
Term note payable—domestic, net of discounts	343,319		344,180
Revolving line of credit A Facility
Debt Instrument [Line Items]
Revolving line of credit	490,000		655,000
Revolving B Credit Facility
Debt Instrument [Line Items]
Revolving line of credit	159,922		345,446
Revolving C Credit Facility
Debt Instrument [Line Items]
Revolving line of credit	35,000		35,000
Revolving line of credit B Facility—foreign swing line
Debt Instrument [Line Items]
Revolving line of credit	$ 30,749		$ 0

[1] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using the modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 2.