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Summary of Effect of Derivative Instruments on Statement of Financial Performance (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Not Designated as Hedging Instrument
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative   $ (337)   $ (192)
Cash Flow Hedging
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) (7) (159) (14) (322)
Amount of Gain or (Loss) Reclassified from Accumulated OCI in to Income (Effective Portion) (181) (183) (366) (368)
Amount of Gain or (Loss) Recognized in Income on derivative (Ineffective Portion)     (1) (1)
Foreign Exchange Contract | Other income/(expense) | Not Designated as Hedging Instrument
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Income on Derivative   (337)   (192)
Interest Rate Contract | Cash Flow Hedging
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) (7) (159) (14) (322)
Interest Rate Contract | Interest Expense | Cash Flow Hedging
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI in to Income (Effective Portion) (181) (183) (366) (368)
Amount of Gain or (Loss) Recognized in Income on derivative (Ineffective Portion)     $ (1) $ (1)