Summary of Significant Accounting Policies (Company's Accounts Receivable and Securitized Accounts Receivable) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts, Notes, Loans and Financing Receivable [Line Items]
Securitized gross accounts receivable	$ 298,000	$ 280,000
Accounts Receivable, Gross	842,904	777,106
Less allowance for doubtful accounts	(19,463)	(15,315)	(14,256)	(14,764)
Net accounts receivable	823,441	761,791
Accounts Receivable Domestic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	96,964	84,087
Accounts Receivable Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 447,940	$ 413,019