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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
Mar. 31, 2013
Mar. 31, 2012
Not Designated as Hedging Instrument
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in Income on Derivative   $ 120
Cash Flow Hedging
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) (7) (163)
Amount of Gain or (Loss) Reclassified from Accumulated OCI in to Income (Effective Portion) 185 185
Amount of Gain or (Loss) Recognized in Income on derivative (Ineffective Portion)   (1)
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) (163)
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) 185 185
Amount of Gain or (Loss) Recognized in Income on derivative (Ineffective Portion)   (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   $ 120