Accounts and Other Receivables - Company's Accounts Receivable and Securitized Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 3,260,247	$ 2,153,661
Less allowance for credit losses	(90,724)	(86,886)	$ (83,882)	$ (70,890)
Net accounts and securitized accounts receivable	3,169,523	2,066,775
Gross domestic accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	1,204,323	719,675
Gross domestic securitized accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	1,098,000	700,000
Gross foreign receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total gross receivables	$ 957,924	$ 733,986