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Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement $ 141.4 $ 24.3
Contractual Unpaid Principal
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Junior subordinated notes $ 146.7 $ 157.0