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Segment Information - Reported Revenue and Profit Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Revenue |  |  |  |  |  |  |  |
Total revenue | $ 244,679 |  | $ 243,376 |  | $ 749,536 |  | $ 726,352 |
Income (loss) before income taxes |  |  |  |  |  |  |  |
Total income (loss) before income taxes | 10,896 |  | 8,163 |  | 16,141 |  | 20,550 |
Private Client Division [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total revenue | 142,606 | [1] | 144,316 | [1] | 435,770 | [1] | 430,963 | [1]
Income (loss) before income taxes |  |  |  |  |  |  |  |
Total income (loss) before income taxes | 18,898 | [1] | 15,088 | [1] | 36,766 | [1] | 48,113 | [1]
Asset management fees | 77.50% |  | 77.50% |  | 77.50% |  | 77.50% |
Asset Management [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total revenue | 24,801 | [1] | 21,488 | [1] | 74,443 | [1] | 64,450 | [1]
Income (loss) before income taxes |  |  |  |  |  |  |  |
Total income (loss) before income taxes | 8,264 | [1] | 6,387 | [1] | 24,300 | [1] | 20,332 | [1]
Asset management fees | 22.50% |  | 22.50% |  | 22.50% |  | 22.50% |
Capital Markets [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total revenue | 71,226 |  | 68,460 |  | 221,324 |  | 201,495 |
Income (loss) before income taxes |  |  |  |  |  |  |  |
Total income (loss) before income taxes | 5,699 |  | 4,301 |  | 23,965 |  | 8,806 |
Commercial Mortgage Banking [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total revenue | 6,349 |  | 9,314 |  | 18,179 |  | 26,857 |
Income (loss) before income taxes |  |  |  |  |  |  |  |
Total income (loss) before income taxes | 1,815 |  | 2,823 |  | 7,269 |  | 7,977 |
Corporate and Other [Member] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |
Total revenue | (303) |  | (202) |  | (180) |  | 2,587 |
Income (loss) before income taxes |  |  |  |  |  |  |  |
Total income (loss) before income taxes | $ (23,780) |  | $ (20,436) |  | $ (76,159) |  | $ (64,678) |
[1] | Asset management fees are allocated 22.5% to the Asset Management and 77.5% to the Private Client segments.

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