Changes in Allowance for Doubtful Accounts (Detail) (Allowance for Doubtful Accounts, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of year	$ 24,510	$ 20,863	$ 10,066
Effect of foreign exchange movement on opening balance	2,513	(2,725)	1,770
Change in provision for bad debts-reported in statement of operations	6,436	6,372	9,027
Other, including charge-offs	(8,209)	0	0
Balance, end of year	$ 25,250	$ 24,510	$ 20,863