Basis of Presentation and Summary of Significant Accounting Policies - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	$ 2,153,661	$ 2,610,824
Less allowance for credit losses	(86,886)	(70,890)	$ (59,963)	$ (46,031)
Net accounts and securitized accounts receivable	2,066,775	2,539,934
Gross domestic unsecuritized accounts receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	719,675	734,410
Gross domestic securitized accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	700,000	970,973
Gross foreign receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	$ 733,986	$ 905,441