Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Assets, Current [Line Items]
Short term securities (for resale)	$ 1,034	$ 863
VAT	16,707	4,458
Other taxes and duties	14,827	(524)
Other short-term receivables	20,279	8,188
Total	$ 52,847	$ 12,985