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Summary of Effect of Derivative Instruments on Statements of Operations and Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ (8) $ (7) $ (31) $ (14)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (153) (181) (312) (366)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)       (1)
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) (8) (7) (31) (14)
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) (153) (181) (312) (366)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)       $ (1)