Accounts Receivable - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross domestic securitized accounts receivable	$ 665,000	$ 675,000
Accounts Receivable, Gross	1,419,500	1,372,639
Less allowance for doubtful accounts	(22,543)	(23,842)	$ (23,291)	$ (22,416)
Net accounts and securitized accounts receivable	1,396,957	1,348,797
Accounts Receivable Domestic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	367,919	330,466
Accounts Receivable Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 386,581	$ 367,173