Summary of Significant Accounting Policies - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross domestic securitized accounts receivable	$ 349,000	$ 298,000
Accounts Receivable, Gross	944,767	842,904
Less allowance for doubtful accounts	(22,416)	(19,463)	(15,315)	(14,256)
Net accounts and securitized accounts receivable	922,351	823,441
Accounts Receivable Domestic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	107,627	96,964
Accounts Receivable Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 488,140	$ 447,940