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Segment Information - Reported Revenue and Profit Before Income Taxes (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Interest based revenue $ 35.1 $ 33.9 $ 37.7
Contingency damages amount 30    
Asset Management [Member]
      
Segment Reporting Information [Line Items]      
Performance fees income 3.5 2.0 6.8
Private Client [Member]
      
Segment Reporting Information [Line Items]      
Performance fees income $ 7.6 $ 1.0 $ 6.1