Business Segment Information (Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Capital Expenditures | $ 13,790 | $ 13,111 | $ 41,300 | $ 44,992 |
| Depreciation | 5,346 | 5,602 | 16,348 | 16,392 |
| Amortization | 7,008 | 5,998 | 20,031 | 17,895 |
Private Banks [Member] | ||||
| Capital Expenditures | 9,219 | 8,452 | 27,032 | 27,119 |
| Depreciation | 3,913 | 4,044 | 11,913 | 11,796 |
| Amortization | 4,762 | 3,767 | 13,599 | 11,233 |
Investment Advisors [Member] | ||||
| Capital Expenditures | 3,146 | 2,976 | 9,184 | 9,752 |
| Depreciation | 552 | 602 | 1,699 | 1,758 |
| Amortization | 1,604 | 1,362 | 4,573 | 4,066 |
Institutional Investors [Member] | ||||
| Capital Expenditures | 508 | 615 | 1,640 | 2,476 |
| Depreciation | 276 | 297 | 836 | 864 |
| Amortization | 200 | 305 | 563 | 910 |
Investment Managers [Member] | ||||
| Capital Expenditures | 671 | 770 | 2,544 | 4,090 |
| Depreciation | 441 | 467 | 1,379 | 1,410 |
| Amortization | 133 | 204 | 379 | 615 |
Investments In New Businesses [Member] | ||||
| Capital Expenditures | 146 | 147 | 450 | 552 |
| Depreciation | 24 | 36 | 83 | 109 |
| Amortization | 67 | 117 | 191 | 342 |
Total From Business Segments [Member] | ||||
| Capital Expenditures | 13,690 | 12,960 | 40,850 | 43,989 |
| Depreciation | 5,206 | 5,446 | 15,910 | 15,937 |
| Amortization | 6,766 | 5,755 | 19,305 | 17,166 |
Corporate Overhead [Member] | ||||
| Capital Expenditures | 100 | 151 | 450 | 1,003 |
| Depreciation | 140 | 156 | 438 | 455 |
| Amortization | $ 242 | $ 243 | $ 726 | $ 729 |