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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 404,830 | $ 372,331 | $ 810,428 | $ 732,315
Expenses | 278,026 | 259,372 | 552,366 | 511,234
Operating profit (loss) | 126,804 | 112,959 | 258,062 | 221,081
Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 121,126 | 116,184 | 243,290 | 228,818
Expenses | 114,842 | 112,353 | 227,044 | 220,903
Operating profit (loss) | 6,284 | 3,831 | 16,246 | 7,915
Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 99,890 | 92,746 | 199,082 | 180,984
Expenses | 53,052 | 49,380 | 105,505 | 96,919
Operating profit (loss) | 46,838 | 43,366 | 93,577 | 84,065
Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 83,434 | 78,068 | 168,925 | 155,072
Expenses | 40,871 | 38,668 | 82,120 | 77,496
Operating profit (loss) | 42,563 | 39,400 | 86,805 | 77,576
Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 97,566 | 83,616 | 194,421 | 164,103
Expenses | 63,321 | 53,847 | 126,659 | 105,912
Operating profit (loss) | 34,245 | 29,769 | 67,762 | 58,191
Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,814 | 1,717 | 4,710 | 3,338
Expenses | 5,940 | 5,124 | 11,038 | 10,004
Operating profit (loss) | $ (3,126) | $ (3,407) | $ (6,328) | $ (6,666)

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