Accounts Receivable - Company's Accounts Receivable and Securitized Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 2,020,758	$ 1,274,857
Gross domestic securitized accounts receivable	656,000	614,000
Less allowance for doubtful accounts	(30,072)	(21,903)	$ (22,543)	$ (23,842)
Net accounts and securitized accounts receivable	1,990,686	1,252,954
Gross domestic accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	627,138	338,275
Gross foreign receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 737,620	$ 322,582