Accounts Receivable - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross domestic securitized accounts receivable	$ 393,600	$ 349,000
Accounts Receivable, Gross	1,132,553	944,767
Less allowance for doubtful accounts	(23,291)	(22,416)	(21,173)	(19,463)
Net accounts and securitized accounts receivable	1,109,262	922,351
Accounts Receivable Domestic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	218,672	107,627
Accounts Receivable Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 520,281	$ 488,140