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Effect of Derivative Instruments on Consolidated Statement of Operations (Detail) - Designated as Hedging Instrument [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Interest Expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Loss on Cash Flow Hedge Ineffectiveness $ 11,000 $ 120,000 $ 14,000 $ 163,000
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion) (246,000) (1,131,000) 918,000 2,317,000
(Loss) Gain on Cash Flow Hedge Ineffectiveness, Net (11,000) (120,000) (14,000) (163,000)
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) or Gain Recognized in OCI on Derivative (Effective Portion) (3,863,000) (1,314,000) (1,343,000) (5,019,000)
Embedded Derivative Financial Instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
(Loss) Gain on Cash Flow Hedge Ineffectiveness, Net $ (633,000) $ 0 $ 1,720,000 $ 0