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Segment Information - Reported Revenue and Profit Before Income Taxes (Detail) (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
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 293,362 | $ 243,376 | $ 243,830 | $ 239,146 | $ 249,415 | $ 231,838 | $ 233,145 | $ 238,214 | $ 1,019,714 | $ 952,612 | $ 958,992
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Total income (loss) before income taxes | 23,359 | 8,163 | 5,674 | 6,713 | (7,135) | 5,258 | 7,839 | (6,489) | 43,909 | (527) | 17,848
Private Client Division [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 600,071 | 550,797 | 541,365
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Total income (loss) before income taxes |  |  |  |  |  |  |  |  | 65,924 | 53,487 | 59,070
Asset management fees |  |  |  |  |  |  |  |  | 77.50% | 77.50% | 77.50%
Asset Management [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 102,214 | 84,160 | 71,052
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Total income (loss) before income taxes |  |  |  |  |  |  |  |  | 40,951 | 25,436 | 20,759
Asset management fees |  |  |  |  |  |  |  |  | 22.50% | 22.50% | 22.50%
Capital Markets [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 281,377 | 283,139 | 322,147
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Total income (loss) before income taxes |  |  |  |  |  |  |  |  | 6,968 | (15,324) | 12,996
Commercial Mortgage Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 34,144 | 35,682 | 28,923
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Total income (loss) before income taxes |  |  |  |  |  |  |  |  | 11,413 | 15,267 | 11,428
Corporate/Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 1,908 | (1,166) | (4,495)
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |
Total income (loss) before income taxes |  |  |  |  |  |  |  |  | $ (81,347) | $ (79,393) | $ (86,405)

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