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Cash payments related to separation benefits.

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Compensation expense related to acquisition related awards

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Compensation expense related to deferred cash consideration

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Compensation expense related to service-based awards

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Expense Related To Separation Benefits

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Interests That Would Vest Related To Acquisition Related Awards Based On Current Performance

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Interests That Would Vest Related To Acquisition Related Awards If Maximum Thresholds Were Probable

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Life To Date Accrued Compensation Expense Related To Acquisition Related Awards

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Long Term Incentive Plan Performance Period

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Remaining Compensation Expense Related To Acquisition Related Awards If Maximum Thresholds Were Probable

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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Maximum term of the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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