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Investments of Operating Entities and Consolidated Funds - Securities Sold, Not Yet Purchased (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
US Government Securities [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, at fair value $ 225,679 [1] $ 165,197 [1]
Common Stock [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, at fair value 142,314 123,877
Operating Entities [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, at fair value 400,945 334,251
Operating Entities [Member] | US Government Securities [Member] | Minimum [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, interest rate 0.19% 0.13%
Operating Entities [Member] | US Government Securities [Member] | Maximum [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, interest rate 7.41% 7.41%
Operating Entities [Member] | Corporate Bonds [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, at fair value 7,985 [2] 1,529 [2]
Operating Entities [Member] | Corporate Bonds [Member] | Minimum [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, interest rate 5.55% 5.55%
Operating Entities [Member] | Corporate Bonds [Member] | Maximum [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, interest rate 6.30% 9.50%
Operating Entities [Member] | Options Held [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, at fair value 24,964 43,648
Operating Entities [Member] | Warrants and Rights [Member]
    
Investments Sold, Not yet Purchased [Line Items]    
Securities sold, not yet purchased, at fair value $ 3 $ 0
[1] As of June 30, 2012, maturities ranged from May 2013 to January 2040 and interest rates ranged between 0.19% and 7.41%. As of December 31, 2011, maturities ranged from September 2013 to January 2040 and interest rates ranged between 0.13% and 7.41%.
[2] As of June 30, 2012, the maturities ranged from October 2012 to January 2026 with an interest rate between 5.55% and 6.30%. As of December 31, 2011, maturities ranged from December 2016 to January 2026 and interest rates ranged between 5.55% and 9.50%.