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Effect of Derivative Instruments on Consolidated Statement of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) $ (3,991) $ (8,026) $ (5,293) $ (8,203)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (4,944) (7,374) (10,492) (15,012)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (23) (104) (33) (102)
Interest rate contracts
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion) (3,991) (8,026) (5,293) (8,203)
Interest rate contracts | Interest Expense
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (4,944) (7,374) (10,492) (15,012)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) (23) (104) (33) (102)
Not Designated as Hedging Instrument [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ (9) $ 0 $ (33) $ 0