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Acquisition and Transition Costs and Intangible Asset Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Business Acquisition [Line Items]        
Acquisition and Transition Costs $ 1,016 $ 0 $ 1,116 $ 58
Investment Banking [Member]
       
Business Acquisition [Line Items]        
Intangible Assets, Net (Excluding Goodwill) 77 204 241 408
Investment Management [Member]
       
Business Acquisition [Line Items]        
Intangible Assets, Net (Excluding Goodwill) $ 1,486 $ 1,851 $ 3,250 $ 3,641