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Effect of Derivative Instruments on Consolidated Statement of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Designated as Hedging Instrument [Member] | Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) $ (1,186) $ (2,192)
(Loss) Gain on Cash Flow Hedge Ineffectiveness, Net (43) (60)
Designated as Hedging Instrument [Member] | Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion) (3,705) (4,347)
Not Designated as Hedging Instrument [Member] | Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative Instruments, (Loss) Gain Recognized in Income, Net $ 0 $ (3)