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Bank Borrowings - Additional Information (Detail)
In Millions, unless otherwise specified
Dec. 31, 2013
USD ($)
Dec. 31, 2013
EUR (€)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
EUR (€)
Equity Method Investments And Cost Method Investments [Abstract]        
Amount outstanding under lines of credit $ 0us-gaap_LineOfCreditFacilityAmountOutstanding   $ 0.1us-gaap_LineOfCreditFacilityAmountOutstanding  
Weighted average interest rate on borrowings under lines of credit 3.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd 3.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd 3.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd 3.70%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Maximum borrowing capacity $ 8.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity € 5.8us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 7.6us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity € 5.8us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity