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Derivative Financial Instruments - Fair Value Derivatives Instruments (Detail) (Derivatives Not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 23,966 $ 20,497
Other Liabilities [Member] | Interest rate swaps [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives 23,966 20,497
Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 23,966 20,497
Other Assets [Member] | Interest rate swaps [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 23,966 $ 20,497