Supplemental Financial Information - Accounts Receivable, Net of Allowance for Doubtful Accounts (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]
Trade receivables	$ 478,992	$ 555,451
Value added tax receivables	13,884	11,615
Amounts held in escrow	11,555	12
Interest receivable	6	2,540
Related party receivables	527	577
Other	154	606
Receivables Gross Current, Total	505,118	570,801
Allowance for bad debts	(5,458)	(6,867)	(31,908)	(41,698)
Total	$ 499,660	$ 563,934