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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 408,682 | $ 386,018 | $ 1,219,110 | $ 1,118,333
Expenses | 281,320 | 271,288 | 833,686 | 782,522
Operating profit (loss) | 127,362 | 114,730 | 385,424 | 335,811
Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 118,449 | 118,499 | 361,739 | 347,317
Expenses | 116,471 | 115,806 | 343,515 | 336,709
Operating profit (loss) | 1,978 | 2,693 | 18,224 | 10,608
Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 102,550 | 94,318 | 301,632 | 275,302
Expenses | 53,287 | 50,585 | 158,792 | 147,504
Operating profit (loss) | 49,263 | 43,733 | 142,840 | 127,798
Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 83,466 | 80,411 | 252,391 | 235,483
Expenses | 40,497 | 40,003 | 122,617 | 117,499
Operating profit (loss) | 42,969 | 40,408 | 129,774 | 117,984
Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 101,275 | 91,020 | 295,696 | 255,123
Expenses | 65,296 | 59,831 | 191,955 | 165,743
Operating profit (loss) | 35,979 | 31,189 | 103,741 | 89,380
Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,942 | 1,770 | 7,652 | 5,108
Expenses | 5,769 | 5,063 | 16,807 | 15,067
Operating profit (loss) | $ (2,827) | $ (3,293) | $ (9,155) | $ (9,959)

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