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Summary of Effect of Derivative Instruments on Statements of Operations and Comprehensive Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)   $ (1)   $ (32)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)   (146)   (459)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) $ 0 0 $ 0 0
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)   (1)   (32)
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)   (146)   (459)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion) $ 0 $ 0 $ 0 $ 0