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Fair Value Measurement of Assets and Liabilities - Assets and Liabilities Measured at Fair Value on Recurring and Non-Recurring Basis (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unpaid principal balances of loans held for sale $ 115.4 $ 24.3
Contractual Unpaid Principal [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Junior subordinated notes $ 146.7 $ 157.0