Summary of Significant Accounting Policies - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	$ 1,825,515	$ 1,274,857
Gross domestic securitized accounts receivable	591,000	614,000
Less allowance for doubtful accounts	(32,506)	(21,903)	$ (23,842)	$ (22,416)
Net accounts and securitized accounts receivable	1,793,009	1,252,954
Accounts Receivable Domestic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	529,885	338,275
Accounts Receivable Foreign
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivables	$ 704,630	$ 322,582