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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, 2014
Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ (23) $ (7)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (159) (185)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)      
Designated as Hedging | Cash Flow Hedging | Interest Rate Contracts
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) (23) (7)
Designated as Hedging | Cash Flow Hedging | Interest Rate Contracts | Interest Expense
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (159) (185)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)