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Summary of Impact of Derivatives in Cash Flow Hedging Relationships on Statement of Operations and Statement of OCI (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Derivative [Line Items]        
Amortization Reclassified from OCI into Income (Loss) $ (579) $ (531) $ (1,690) $ (1,633)
Interest Expense [Member]
       
Derivative [Line Items]        
Amortization Reclassified from OCI into Income (Loss) $ (579) $ (531) $ (1,690) $ (1,633)