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Bank Borrowings - Additional Information (Detail)
Mar. 31, 2014
USD ($)
Mar. 31, 2014
EUR (€)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
EUR (€)
Equity Method Investments And Cost Method Investments [Abstract]        
Amount outstanding under lines of credit $ 0us-gaap_LineOfCreditFacilityAmountOutstanding   $ 0us-gaap_LineOfCreditFacilityAmountOutstanding  
Maximum borrowing capacity $ 8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity € 5,800,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 8,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity € 5,800,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity