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Other Current and Non-Current Liabilities - Components of Other Current Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Other Liabilities Disclosure [Abstract]    
Deferred revenue $ 26,033 $ 23,271
VAT and sales tax payable 5,011 3,418
Other 16,676 13,701
Total other current liabilities $ 47,720 $ 40,390