Accounts Receivable - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross domestic securitized accounts receivable	$ 764,000	$ 675,000
Accounts Receivable, Gross	1,597,877	1,372,639
Less allowance for doubtful accounts	(22,400)	(23,842)	$ (22,754)	$ (22,416)
Net accounts and securitized accounts receivable	1,575,477	1,348,797
Accounts Receivable Domestic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	378,314	330,466
Accounts Receivable Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 455,563	$ 367,173