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Financial Instruments - Fair Value of Company's Swaps and their Classification (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Liability Derivatives , Fair Value $ 4.4 $ 17.1
Other Liabilities [Member] | Interest Rate Products [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives , Fair Value $ 4.4 $ 17.1