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Business Segment Information - Schedule Of Additional Information Pertaining To Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 16,980 | $ 12,138 | $ 43,897 | $ 45,617
Depreciation | 7,485 | 8,341 | 23,077 | 25,097
Amortization | 11,912 | 10,413 | 33,071 | 31,284
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 16,530 | 11,916 | 42,911 | 44,588
Depreciation | 6,954 | 7,333 | 18,828 | 22,199
Amortization | 11,573 | 10,343 | 32,574 | 31,027
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 6,054 | 7,196 | 16,690 | 21,260
Depreciation | 1,788 | 1,659 | 3,582 | 4,874
Amortization | 1,301 | 80 | 1,704 | 161
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 6,479 | 2,764 | 16,192 | 13,782
Depreciation | 2,681 | 2,620 | 7,634 | 8,356
Amortization | 5,427 | 5,147 | 16,046 | 15,347
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 2,978 | 1,092 | 7,512 | 6,244
Depreciation | 1,889 | 2,254 | 5,914 | 6,625
Amortization | 2,473 | 2,169 | 7,342 | 6,439
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 761 | 740 | 1,859 | 2,589
Depreciation | 474 | 614 | 1,287 | 1,816
Amortization | 1,956 | 1,851 | 5,775 | 5,619
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 258 | 124 | 658 | 713
Depreciation | 122 | 186 | 411 | 528
Amortization | 416 | 1,096 | 1,707 | 3,461
Corporate overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 450 | 222 | 986 | 1,029
Depreciation | 531 | 1,008 | 4,249 | 2,898
Amortization | $ 339 | $ 70 | $ 497 | $ 257

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