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Business Changes and Developments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |  |  |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 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 | Dec. 31, 2013 Pan [Member] | Dec. 31, 2012 Pan [Member] | Dec. 31, 2011 Pan [Member] | Dec. 03, 2013 Pan [Member] | Mar. 16, 2013 Pan [Member] | Mar. 15, 2013 Pan [Member] | Dec. 31, 2008 Pan [Member] | Dec. 31, 2012 Mt Eden Investment Advisors LLC [Member] | Oct. 31, 2012 Mt Eden Investment Advisors LLC [Member] | Dec. 31, 2013 Mt Eden Investment Advisors LLC [Member] | Dec. 28, 2012 Mt Eden Investment Advisors LLC [Member] | Dec. 31, 2013 Mt Eden Investment Advisors LLC [Member] Minimum [Member] | Dec. 31, 2013 Mt Eden Investment Advisors LLC [Member] Maximum [Member] | Oct. 31, 2012 Mt Eden Investment Advisors LLC [Member] Noncontrolling Interest [Member] | Dec. 28, 2012 Mt Eden Investment Advisors LLC [Member] Client Related Intangible Assets [Member] | Dec. 28, 2012 Mt Eden Investment Advisors LLC [Member] Non-compete agreements [Member] | Dec. 28, 2012 Mt Eden Investment Advisors LLC [Member] Other Intangible Assets [Member] | Dec. 31, 2013 Evercore Private Capital Advisory L.P. [Member] | Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary [Member] Pan [Member] | Mar. 15, 2013 Variable Interest Entity, Primary Beneficiary [Member] Pan [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment | $ 67,560 |  |  |  | $ 69,320 |  |  |  | $ 67,560 | $ 69,320 |  | $ 0 | $ 2,749 |  |  |  |  | $ 4,158 |  |  |  |  |  |  |  |  |  |  |  |  |
Income from Equity Method Investments | 5,993 | 562 | 1,015 | 756 | 1,333 | 415 | 719 | 2,385 | 8,326 | 4,852 | 919 | (55) | 90 | (420) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,414 |  |  |  |  |  |  |  |  | 3,020
Intangible assets | 54,269 |  |  |  | 55,399 |  |  |  | 54,269 | 55,399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,630 | 169 | 445 |  |  | 1,440
Amortization period of intangible assets (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years | 10 years |  |  |  |  |  | 7 years |
Impairment Charges |  |  |  |  |  |  |  |  | 2,888 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,718 |
Special Charges |  |  |  |  |  |  |  |  | 170 | 662 | 3,894 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations Revenue |  |  |  |  |  |  |  |  | 989 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations Pretax gains (losses) |  |  |  |  |  |  |  |  | (1,542) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion owned by Company (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |
Portion owned by employees (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Cash received by sellers for consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,917 |  |  |  |  |  |  |  |  |  |  |
Value of equity interest paid to sellers for consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,694 |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 282 |  |  |  |  |  |  |  |  |  |  |
Amortization expense of intangible assets |  |  |  |  |  |  |  |  | 7,994 | 10,872 | 14,315 |  |  |  |  |  |  |  |  |  | 455 |  |  |  |  |  |  |  |  |  |
Funded repayment of outstanding capital notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,047 |  |  |  |  |  |  |  |  |  |  |  |

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