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Restructuring (Details) (Equities division, USD $)
In Thousands, unless otherwise specified
1 Months Ended 6 Months Ended
Aug. 31, 2011
employee
Jun. 30, 2012
Restructuring    
Number of employees impacted 62  
Changes in the company's liability related to restructuring    
Balance at the beginning of the period   $ 1,427
Restructuring expense   (212)
Less: Non-cash charges   79
Balance at the end of the period   581
Real estate
   
Changes in the company's liability related to restructuring    
Payments for restructuring   (198)
Third party vendor contracts
   
Changes in the company's liability related to restructuring    
Payments for restructuring   $ (515)