Accounts and Other Receivables - Company's Accounts Receivable and Securitized Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 2,593,526	$ 2,153,661
Less allowance for credit losses	(87,902)	(86,886)	$ (74,828)	$ (70,890)
Net accounts and securitized accounts receivable	2,505,624	2,066,775
Gross domestic accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	844,760	719,675
Gross domestic securitized accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	915,000	700,000
Gross foreign receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 833,766	$ 733,986