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Derivative Financial Instruments - Additional Information (Detail) (Foreign Exchange Forward, Not Designated as Hedging Instrument, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Foreign Exchange Forward | Not Designated as Hedging Instrument
        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Changes in fair value foreign currency forward contracts $ 1,507 $ 1,528 $ (247) $ (247)
Notional value of derivative $ 38,750   $ 38,750  
Contract expiring month     2013-09