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Variable Interest Entities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Tax Credit Structures
Jun. 30, 2014
Tax Credit Structures
Dec. 31, 2013
Tax Credit Structures
Jun. 30, 2014
Leveraged Leasing Transactions
Dec. 31, 2013
Leveraged Leasing Transactions
Jun. 30, 2014
Leveraged Leasing Transactions
Lower Limit
Jun. 30, 2013
Leveraged Leasing Transactions
Lower Limit
Jun. 30, 2014
Leveraged Leasing Transactions
Upper Limit
Jun. 30, 2013
Leveraged Leasing Transactions
Upper Limit
Variable Interest Entity [Line Items]                  
Funding of asset's cost via an equity interest           20.00% 20.00% 30.00% 30.00%
Funding of asset's cost via third party non recourse debt holders           70.00% 70.00% 80.00% 80.00%
Carrying amounts $ 204.2 $ 204.2 $ 222.3 $ 595.4 $ 671.2        
Exposure to loss from liquidity arrangements and obligations to purchase assets 0 0   0          
Liabilities related to unfunded commitments 19.0 19.0 19.8            
Affordable housing tax credits and other tax benefits $ 13.9 $ 28.7