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Fair Value, Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets [Abstract]    
Investments in government securities $ 60,996 $ 344,453
Investments in securities 273,087 249,887
Investments in affiliated registered investment companies 134,548 170,605
Liabilities [Abstract]    
Securities sold, not yet purchased 12,905 17,571
PMV warrant liability 5,280 0
Trading - U.S. Treasury Bills [Member]    
Assets [Abstract]    
Investments in government securities 60,996 344,453
Common Stocks [Member]    
Assets [Abstract]    
Investments in securities 265,156 237,377
Closed-end Funds [Member]    
Assets [Abstract]    
Investments in affiliated registered investment companies 64,381 106,719
Mutual Funds [Member]    
Assets [Abstract]    
Investments in securities 1,351 1,294
Investments in affiliated registered investment companies 70,167 63,886
Other [Member]    
Assets [Abstract]    
Investments in securities 6,580 11,216
Recurring Basis [Member]    
Assets [Abstract]    
Cash equivalents 314,172 34,010
Investments in securities 334,083 594,340
Investments in affiliated registered investment companies 134,548 170,605
Total investments held at fair value 468,631 764,945
Total assets at fair value 782,803 798,955
Liabilities [Abstract]    
Securities sold, not yet purchased 12,905 17,571
PMV warrant liability 5,280  
Total liabilities at fair value 18,185  
Recurring Basis [Member] | Trading - U.S. Treasury Bills [Member]    
Assets [Abstract]    
Investments in government securities 60,996 344,453
Recurring Basis [Member] | Common Stocks [Member]    
Assets [Abstract]    
Investments in securities 265,156 237,377
Liabilities [Abstract]    
Trading 9,838 16,090
Recurring Basis [Member] | Closed-end Funds [Member]    
Assets [Abstract]    
Investments in affiliated registered investment companies 64,381 106,719
Recurring Basis [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Investments in securities 1,351 1,294
Investments in affiliated registered investment companies 70,167 63,886
Recurring Basis [Member] | Other [Member]    
Assets [Abstract]    
Investments in securities 6,580 11,216
Liabilities [Abstract]    
Trading 3,067 1,481
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets [Abstract]    
Cash equivalents 314,172 34,010
Investments in securities 327,943 583,781
Investments in affiliated registered investment companies 126,548 168,605
Total investments held at fair value 454,491 752,386
Total assets at fair value 768,663 786,396
Liabilities [Abstract]    
Securities sold, not yet purchased 11,797 16,633
PMV warrant liability 5,280  
Total liabilities at fair value 17,077  
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Trading - U.S. Treasury Bills [Member]    
Assets [Abstract]    
Investments in government securities 60,996 344,453
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Stocks [Member]    
Assets [Abstract]    
Investments in securities 260,763 231,901
Liabilities [Abstract]    
Trading 9,838 16,090
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Closed-end Funds [Member]    
Assets [Abstract]    
Investments in affiliated registered investment companies 56,381 104,719
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Investments in securities 1,351 1,294
Investments in affiliated registered investment companies 70,167 63,886
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member]    
Assets [Abstract]    
Investments in securities 4,833 6,133
Liabilities [Abstract]    
Trading 1,959 543
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets [Abstract]    
Cash equivalents 0 0
Investments in securities 3,540 6,061
Investments in affiliated registered investment companies 0 0
Total investments held at fair value 3,540 6,061
Total assets at fair value 3,540 6,061
Liabilities [Abstract]    
Securities sold, not yet purchased 1,108 938
PMV warrant liability 0  
Total liabilities at fair value 1,108  
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Trading - U.S. Treasury Bills [Member]    
Assets [Abstract]    
Investments in government securities 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Common Stocks [Member]    
Assets [Abstract]    
Investments in securities 2,320 5,440
Liabilities [Abstract]    
Trading 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Closed-end Funds [Member]    
Assets [Abstract]    
Investments in affiliated registered investment companies 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Investments in securities 0 0
Investments in affiliated registered investment companies 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other [Member]    
Assets [Abstract]    
Investments in securities 1,220 621
Liabilities [Abstract]    
Trading 1,108 938
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets [Abstract]    
Cash equivalents 0 0
Investments in securities 2,600 4,498
Investments in affiliated registered investment companies 8,000 2,000
Total investments held at fair value 10,600 6,498
Total assets at fair value 10,600 6,498
Liabilities [Abstract]    
Securities sold, not yet purchased 0 0
PMV warrant liability 0  
Total liabilities at fair value 0  
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Trading - U.S. Treasury Bills [Member]    
Assets [Abstract]    
Investments in government securities 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Common Stocks [Member]    
Assets [Abstract]    
Investments in securities 2,073 36
Liabilities [Abstract]    
Trading 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Closed-end Funds [Member]    
Assets [Abstract]    
Investments in affiliated registered investment companies 8,000 2,000
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mutual Funds [Member]    
Assets [Abstract]    
Investments in securities 0 0
Investments in affiliated registered investment companies 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other [Member]    
Assets [Abstract]    
Investments in securities 527 4,462
Liabilities [Abstract]    
Trading $ 0 $ 0