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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | $ 12,138 | $ 14,888 | $ 45,617 | $ 49,698
Depreciation | 8,341 | 9,197 | 25,097 | 26,509
Amortization | 10,413 | 9,797 | 31,284 | 28,851
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 11,916 | 14,581 | 44,588 | 48,414
Depreciation | 7,333 | 8,950 | 22,199 | 25,852
Amortization | 10,343 | 9,723 | 31,027 | 28,651
Operating Segments | Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 2,764 | 7,580 | 13,782 | 24,652
Depreciation | 2,620 | 5,565 | 8,356 | 16,370
Amortization | 5,147 | 4,852 | 15,347 | 14,216
Operating Segments | Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 1,092 | 3,545 | 6,244 | 11,499
Depreciation | 2,254 | 540 | 6,625 | 1,557
Amortization | 2,169 | 1,933 | 6,439 | 5,698
Operating Segments | Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 740 | 390 | 2,589 | 1,495
Depreciation | 614 | 338 | 1,816 | 922
Amortization | 1,851 | 1,834 | 5,619 | 5,486
Operating Segments | Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 7,196 | 2,804 | 21,260 | 9,962
Depreciation | 1,659 | 2,227 | 4,874 | 6,268
Amortization | 80 | 209 | 161 | 566
Operating Segments | Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 124 | 262 | 713 | 806
Depreciation | 186 | 280 | 528 | 735
Amortization | 1,096 | 895 | 3,461 | 2,685
Corporate overhead |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditure | 222 | 307 | 1,029 | 1,284
Depreciation | 1,008 | 247 | 2,898 | 657
Amortization | $ 70 | $ 74 | $ 257 | $ 200

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