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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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 261,635 | $ 251,752 | $ 241,237 | $ 237,898 | $ 226,247 | $ 233,227 | $ 237,760 | $ 232,493 | $ 992,522 | $ 929,727 | $ 900,835
Expenses |  |  |  |  |  |  |  |  | 736,172 | 683,884 | 644,052
Operating profit (loss) |  |  |  |  |  |  |  |  | 256,350 | 245,843 | 256,783
Operating margin |  |  |  |  |  |  |  |  | 26.00% | 26.00% | 29.00%
Private Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 364,788 | 348,122 | 346,668
Expenses |  |  |  |  |  |  |  |  | 357,001 | 339,339 | 310,633
Operating profit (loss) |  |  |  |  |  |  |  |  | 7,787 | 8,783 | 36,035
Operating margin |  |  |  |  |  |  |  |  | 2.00% | 3.00% | 10.00%
Investment Advisors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 202,703 | 189,780 | 183,378
Expenses |  |  |  |  |  |  |  |  | 120,146 | 110,438 | 110,388
Operating profit (loss) |  |  |  |  |  |  |  |  | 82,557 | 79,342 | 72,990
Operating margin |  |  |  |  |  |  |  |  | 41.00% | 42.00% | 40.00%
Institutional Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 227,889 | 210,027 | 206,531
Expenses |  |  |  |  |  |  |  |  | 116,546 | 106,585 | 106,934
Operating profit (loss) |  |  |  |  |  |  |  |  | 111,343 | 103,442 | 99,597
Operating margin |  |  |  |  |  |  |  |  | 49.00% | 49.00% | 48.00%
Investment Managers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 193,484 | 177,975 | 160,159
Expenses |  |  |  |  |  |  |  |  | 127,525 | 115,963 | 103,421
Operating profit (loss) |  |  |  |  |  |  |  |  | 65,959 | 62,012 | 56,738
Operating margin |  |  |  |  |  |  |  |  | 34.00% | 35.00% | 35.00%
Investments In New Businesses [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,658 | 3,823 | 4,099
Expenses |  |  |  |  |  |  |  |  | 14,954 | 11,559 | 12,676
Operating profit (loss) |  |  |  |  |  |  |  |  | $ (11,296) | $ (7,736) | $ (8,577)

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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