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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 299,024 | $ 280,655 | $ 274,574 | $ 271,879 | $ 261,635 | $ 251,752 | $ 241,237 | $ 237,898 | $ 1,126,132 | $ 992,522 | $ 929,727
Expenses |  |  |  |  |  |  |  |  | 824,279 | 736,172 | 683,884
Operating profit (loss) |  |  |  |  |  |  |  |  | 301,853 | 256,350 | 245,843
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | 22,112 |  |
Total Profit (Loss) |  |  |  |  |  |  |  |  | 323,965 |  |
Private Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 397,138 | 364,788 | 348,122
Expenses |  |  |  |  |  |  |  |  | 392,399 | 357,001 | 339,339
Operating profit (loss) |  |  |  |  |  |  |  |  | 4,739 | 7,787 | 8,783
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | 22,112 |  |
Total Profit (Loss) |  |  |  |  |  |  |  |  | 26,851 |  |
Investment Advisors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 241,252 | 202,703 | 189,780
Expenses |  |  |  |  |  |  |  |  | 133,962 | 120,146 | 110,438
Operating profit (loss) |  |  |  |  |  |  |  |  | 107,290 | 82,557 | 79,342
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | 0 |  |
Total Profit (Loss) |  |  |  |  |  |  |  |  | 107,290 |  |
Institutional Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 257,658 | 227,889 | 210,027
Expenses |  |  |  |  |  |  |  |  | 133,218 | 116,546 | 106,585
Operating profit (loss) |  |  |  |  |  |  |  |  | 124,440 | 111,343 | 103,442
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | 0 |  |
Total Profit (Loss) |  |  |  |  |  |  |  |  | 124,440 |  |
Investment Managers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 226,081 | 193,484 | 177,975
Expenses |  |  |  |  |  |  |  |  | 148,977 | 127,525 | 115,963
Operating profit (loss) |  |  |  |  |  |  |  |  | 77,104 | 65,959 | 62,012
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | 0 |  |
Total Profit (Loss) |  |  |  |  |  |  |  |  | 77,104 |  |
Investments In New Businesses [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,003 | 3,658 | 3,823
Expenses |  |  |  |  |  |  |  |  | 15,723 | 14,954 | 11,559
Operating profit (loss) |  |  |  |  |  |  |  |  | (11,720) | (11,296) | (7,736)
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  |  |  |  | 0 |  |
Total Profit (Loss) |  |  |  |  |  |  |  |  | $ (11,720) |  |

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