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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Revenues | $ 271,879 | $ 237,898
Expenses | 198,332 | 179,042
Gross Profit | 73,547 | 58,856
Gain on sale of subsidiary | 22,112 |
Total Profit (Loss) | 95,659 |
Private Banks [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 98,746 | 87,988
Expenses | 96,298 | 87,517
Gross Profit | 2,448 | 471
Gain on sale of subsidiary | 22,112 |
Total Profit (Loss) | 24,560 |
Investment Advisors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 55,191 | 49,468
Expenses | 31,625 | 29,301
Gross Profit | 23,566 | 20,167
Gain on sale of subsidiary | 0 |
Total Profit (Loss) | 23,566 |
Institutional Investors [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 63,162 | 53,317
Expenses | 31,509 | 28,100
Gross Profit | 31,653 | 25,217
Gain on sale of subsidiary | 0 |
Total Profit (Loss) | 31,653 |
Investment Managers [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 53,820 | 46,211
Expenses | 35,162 | 30,426
Gross Profit | 18,658 | 15,785
Gain on sale of subsidiary | 0 |
Total Profit (Loss) | 18,658 |
Investments In New Businesses [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 960 | 914
Expenses | 3,738 | 3,698
Gross Profit | (2,778) | (2,784)
Gain on sale of subsidiary | 0 |
Total Profit (Loss) | $ (2,778) |

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- Definition The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 37, 45 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + 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 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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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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