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Acquisition and Transition Costs and Intangible Asset Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Business Acquisition [Line Items]    
Acquisition and Transition Costs $ 100 $ 58
Investment Banking [Member]
   
Business Acquisition [Line Items]    
Intangible Assets, Net (Excluding Goodwill) 164 204
Investment Management [Member]
   
Business Acquisition [Line Items]    
Intangible Assets, Net (Excluding Goodwill) $ 1,764 $ 1,790