Accounts Receivable - Company's Accounts Receivable and Securitized Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross domestic securitized accounts receivable	$ 385,000	$ 298,000
Accounts Receivable, Gross	1,031,040	842,904
Less allowance for doubtful accounts	(19,576)	(19,463)	(17,742)	(15,315)
Net accounts and securitized accounts receivable	1,011,464	823,441
Accounts Receivable Domestic [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	137,517	96,964
Accounts Receivable Foreign [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Gross	$ 508,523	$ 447,940