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Investments of Operating Entities and Consolidated Funds - Securities Owned at Fair Value (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Investment Holdings [Line Items]    
Securities owned, at fair value $ 900,346 $ 520,888
Securities owned, at fair value 345,292 187,633
Preferred Stock    
Investment Holdings [Line Items]    
Trading Securities, Equity 9,772 5,617
Securities owned, at fair value 24,322 24,314
Common Stock    
Investment Holdings [Line Items]    
Trading Securities, Equity 824,881 472,299
Securities owned, at fair value 236,066 95,565
Warrants and Rights    
Investment Holdings [Line Items]    
Trading Securities, Equity 9,874 7,990
Securities owned, at fair value 6,274 5,279
Government Securities    
Investment Holdings [Line Items]    
Debt Securities, Trading [1] $ 12,892 $ 13,398
Investment Interest Rate 0.00% 0.00%
Securities owned, at fair value $ 0 $ 38,377 [2]
Corporate Bonds    
Investment Holdings [Line Items]    
Debt Securities, Trading [3] 24,625 13,041
Securities owned, at fair value $ 78,630 [4] $ 24,098
Corporate Bonds | Minimum    
Investment Holdings [Line Items]    
Investment Interest Rate 4.875% 2.00%
Corporate Bonds | Maximum    
Investment Holdings [Line Items]    
Investment Interest Rate 10.75% 15.50%
Convertible Bonds    
Investment Holdings [Line Items]    
Debt Securities, Trading [5],[6] $ 6,318 $ 3,000
Investment Interest Rate 8.00% 8.00%
Convertible Bonds | Estimate of Fair Value Measurement [Member]    
Investment Holdings [Line Items]    
Trading Securities, Equity [6] $ 6,300 $ 3,000
Trade Claims    
Investment Holdings [Line Items]    
Debt Securities, Trading [6] 10,488 5,543
Trade Claims | Estimate of Fair Value Measurement [Member]    
Investment Holdings [Line Items]    
Trading Securities, Equity [6] 10,500 5,500
Loans    
Investment Holdings [Line Items]    
Debt Securities, Trading [6] 1,496 $ 0
Loans | Estimate of Fair Value Measurement [Member]    
Investment Holdings [Line Items]    
Trading Securities, Equity [6] $ 1,500  
Consolidated Funds | Government Securities    
Investment Holdings [Line Items]    
Investment Interest Rate   0.00%
Consolidated Funds | Corporate Bonds | Minimum    
Investment Holdings [Line Items]    
Investment Interest Rate 4.87% 5.88%
Consolidated Funds | Corporate Bonds | Maximum    
Investment Holdings [Line Items]    
Investment Interest Rate 6.50% 7.63%
Enterprise Master    
Investment Holdings [Line Items]    
Securities owned, at fair value   $ 469
Enterprise Master | Common Stock    
Investment Holdings [Line Items]    
Securities owned, at fair value   $ 469
[1] As of June 30, 2019, maturities range from August 2019 to October 2019 with an interest rate of 0%. As of December 31, 2018, maturities ranged from April 2019 to August 2019 with an interest rate of 0%.
[2] As of December 31, 2018, maturities ranged from January 2019 to April 2019 and interest rates were 0%.
[3] As of June 30, 2019, maturities ranged from October 2019 to March 2038 and interest rates ranged from 4.88% to 10.75%. As of December 31, 2018, maturities ranged from April 2019 to April 2049 and interest rates ranged from 2% to 15.50%.
[4] As of June 30,2019, maturities ranged from May 2022 to November 2025 and interest rates ranged from 4.87% to 6.50%. As of December 31, 2018, maturities ranged from August 2020 to March 2026 and interest rates ranged from 5.88% to 7.63%.
[5] As of June 30, 2019, maturities range from April 2020 to May 2024 with an interest rate of 8%. As of December 31, 2018, the maturity was June 2020 with an interest rate of 8%
[6] The Company has elected the fair value option for investments in securities of trade claims, convertible bond and term loan with a fair value of $10.5 million, $6.3 million and $1.5 million, respectively, at June 30, 2019. The Company has elected the fair value option for investments in securities of trade claims and convertible bond at a fair value of $5.5 million and $3.0 million, respectively, at December 31, 2018.