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Share-Based and Other Deferred Compensation - Additional information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 41 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Feb. 29, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2014 | Feb. 15, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  | 10,000,000 |  |  |  |  |
Expense Related To Separation Benefits |  |  | $ 845,000 |  | $ 1,124,000 | $ 4,068,000 | $ 4,920,000 |  |
Cash Payments Related To Separation Benefits |  |  | 617,000 |  | 674,000 | 2,379,000 | 2,205,000 |  |
Employee Loans [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Deferred compensation arrangement compensation expense |  |  | 4,246,000 |  | 3,483,000 | $ 14,777,000 | 12,434,000 |  |
Requisite service period (in years) |  |  |  |  |  | 1 year |  |  |
Maximum contractual term (in years) |  |  |  |  |  | 5 years |  |  |
Unamortized deferred compensation |  |  | 34,568,000 |  |  | $ 34,568,000 |  |  |
Equity Grants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  | $ 44.30 |  |  |
Equity Grants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  | $ 51.98 |  |  |
Equity Grants [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense related to Service-based Award |  |  | 29,505,000 |  | 25,124,000 | $ 86,783,000 | 80,083,000 |  |
Long Term Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Performance period (in years) |  |  |  |  |  | 4 years |  |  |
Number Of Payment Installments |  |  |  |  |  | 3 |  |  |
Deferred compensation arrangement compensation expense |  |  | 6,117,000 |  | 1,547,000 | $ 13,595,000 | 4,590,000 |  |
Restricted Stock Units (RSUs) [Member] | Equity Grants [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during period (in shares) |  |  |  |  |  | 3,087,000 |  |  |
Shares vested during period (in shares) |  |  |  |  |  | 2,269,000 |  |  |
Shares forfeited during period (in shares) |  |  |  |  |  | 129,000 |  |  |
Deferred Cash Program [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Deferred compensation, vesting period (in years) |  |  |  |  |  | 4 years |  |  |
Grant Of Deferred Cash Compensation |  |  |  |  |  | $ 41,147,000 |  |  |
Compensation expense related to deferred compensation programs |  |  | 4,281,000 |  | 272,000 | $ 11,399,000 | 1,154,000 |  |
Special Charges [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expense Related To Separation Benefits |  |  |  |  |  |  | 1,863,000 |  |
Cash Payments Related To Separation Benefits |  |  |  |  |  |  | $ 487,000 |  |
Evercore ISI [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Management Basis EBIT Margin (as a percent) |  |  |  |  |  | 15.90% | 15.70% |  |
Management Basis EBIT |  |  |  |  |  | $ 37,960,000 | $ 34,600,000 |  |
Lexicon [Member] | Acquisition Related [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense related to acquisition related awards |  |  |  |  |  |  | 1,237,000 |  |
Compensation expense related to deferred cash consideration |  |  |  |  |  |  | 301,000 |  |
Class E LP Units [Member] | Evercore ISI [Member] | Vested LP Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  | 710,000 |
Class E LP Units [Member] | Evercore ISI [Member] | Unvested LP Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  | 710,000 |
Class E LP Units [Member] | Evercore ISI [Member] | Acquisition Related [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense related to acquisition related awards |  |  | 5,133,000 |  | 6,193,000 | $ 15,683,000 | 16,155,000 |  |
Class G Interests [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Management Basis EBIT Margin (as a percent) |  |  |  |  |  | 12.00% |  |  |
Class G Interests [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Management Basis EBIT Margin (as a percent) |  |  |  |  |  | 16.00% |  |  |
Class G Interests [Member] | Evercore ISI [Member] | Vested LP Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  | 538,000 |
Class G Interests [Member] | Evercore ISI [Member] | Unvested LP Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  | 540,000 |
Class G Interests [Member] | Evercore ISI [Member] | Acquisition Related [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares vested during period (in shares) |  | 371,000 |  |  |  |  |  |  |
Class H Interests [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Class H Interests Performance Period (in years) |  |  |  |  |  | 3 years |  |  |
Class H Interests [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Management Basis EBIT Margin (as a percent) |  |  |  |  |  | 7.00% |  |  |
Management Basis EBIT |  |  |  |  |  | $ 8,000,000 |  |  |
Class H Interests [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Management Basis EBIT Margin (as a percent) |  |  |  |  |  | 17.00% |  |  |
Management Basis EBIT |  |  |  |  |  | $ 48,000,000 |  |  |
Class H Interests [Member] | Evercore ISI [Member] | Vested LP Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  | 2,044,000 |
Class H Interests [Member] | Evercore ISI [Member] | Unvested LP Units [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant Of LP Units (in units) |  |  |  |  |  |  |  | 2,051,000 |
Class G And H Interests [Member] | Evercore ISI [Member] | Acquisition Related [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Compensation expense related to acquisition related awards |  |  | 8,629,000 |  | $ 15,657,000 | 50,379,000 | $ 48,970,000 |  |
Additional Compensation Expense Related To Acquisition Related Awards If Maximum Thresholds Were Probable |  |  | 28,300,000 |  |  |  |  |  |
Life To Date Accrued Compensation Expense Related To Acquisition Related Awards |  |  | $ 91,899,000 |  |  | $ 91,899,000 |  |  |
Scenario, Forecast [Member] | Class G And H Interests [Member] | Evercore ISI [Member] | Acquisition Related [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Interests That Would Vest Related To Acquisition Related Awards Based On Current Performance |  |  |  |  |  |  |  |  | 3,721,000
Remaining Compensation Expense Related To Acquisition Related Awards If Maximum Thresholds Were Probable |  |  |  |  |  |  |  |  | $ 126,325,000
Interests That Would Vest Related To Acquisition Related Awards If Maximum Thresholds Were Probable |  |  |  |  |  |  |  |  | 4,957,000
Subsequent Event [Member] | Class E LP Units [Member] | Evercore ISI [Member] | Acquisition Related [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares vested during period (in shares) | 224,000 |  |  |  |  |  |  |  |

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