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- Definition

Class K Units Probable of Achievement

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Common Stock, Number of Votes

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- Definition

Deferred Compensation Arrangement With Individual Cash Award Tranche One Vesting Amount

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Deferred Compensation Arrangement With Individual Cash Award Tranche Three Vesting Amount

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Deferred Compensation Arrangement With Individual Cash Award Tranche Two Vesting Amount

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Deferred Compensation Arrangement with Individual, Expected Payments

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Deferred Compensation Arrangement with Individual, Number of Installments

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Deferred Compensation Arrangement With Individual, Total Compensation Cost Not Yet Recognized Period For Recognition

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Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized

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Deferred Compensation Vesting Period Years

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- Definition

Grant Of LP Units

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Grant of I-P Units

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Grant of I-P Units, Fair Value of Award

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Grant of K-P Units

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Grant of K-P Units, Fair Value of Award

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K-P Units to be Granted Upon Achievement of Benchmarks

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Limited Partnership Units Convertible Conversion Ratio

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Long Term Incentive Plan Performance Period

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Number of Class I-P Units in Each Tranche

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Number of Consecutive Trading Days Required for Class I-P Units to Exceed Thresholds

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Number of Tranches of Class I-P Units

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Restricted Stock Units Related to Restructuring

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Retirement Notice Requirement

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of commitment made to pay deferred cash remuneration.

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

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Amount of distribution made to individual in accordance with deferred compensation arrangement.

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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 limited partner units issued.

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The number of limited partner units outstanding.

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Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of new stock issued during the period.

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- Details

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Share-Based and Other Deferred Compensation (Details) $ / shares in Units, $ in Thousands					1 Months Ended				3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 01, 2021 USD ($)	Mar. 01, 2020 USD ($)	Feb. 15, 2020 shares	Mar. 01, 2019 USD ($)	Jun. 30, 2019 shares	Nov. 30, 2017 shares	Jul. 31, 2017 vote shares	Nov. 30, 2016 USD ($) tranche Number_Of_Anniversaries shares	Sep. 30, 2021 USD ($) shares	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($) shares	Sep. 30, 2021 USD ($) Installments $ / shares shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 shares	Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued LP Units (in shares) \| shares									0		0	0	0
Headcount Reductions (as a percent)														8.00%
Severance Costs												$ 2,168	$ 26,967
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Units Related to Restructuring \| shares												34,000	150,000
Special Charges [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											$ 3,102		$ 10,437
Special Charges [Member] \| Cash and Deferred Cash Compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs											4,151		26,967
Employee Compensation and Benefits \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Severance Costs									$ 486			$ 2,434
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partnership Units Convertible Conversion Ratio								1	1			1
Amended Two Thousand Sixteen Stock Incentive Plan [Member] \| Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Additional Shares Authorized (in shares) \| shares														6,000,000
Number of Shares Available for Grant (in shares) \| shares									5,103,000			5,103,000
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense									$ 16,877		$ 9,160	$ 29,979	$ 5,339
Deferred Compensation Arrangement with Individual, Distribution Paid										$ 48,461
Long Term Incentive Plan [Member] \| Current Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability									48,455			48,455
Long Term Incentive Plan [Member] \| Noncurrent Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Recorded Liability									$ 52,218			$ 52,218
Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Limited Partners' Capital Account, Units Outstanding \| shares									0		0	0	0
Class J LP Units [Member] \| Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Vested During Period (in shares) \| shares			223,000
Limited Partners' Capital Account, Units Outstanding \| shares									0			0
Issued LP Units (in shares) \| shares									0			0
Class I-P Units [Member] \| Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense									$ 1,130		$ 1,164	$ 3,495	$ 3,468
Grant of I-P Units (in units) \| shares								400,000
Retirement Notice Requirement								1 year
Number of Tranches of Class I-P Units \| tranche								2
Number of Class I-P Units in Each Tranche (in units) \| shares								200,000
Number of Consecutive Trading Days Required for Class I-P Units to Exceed Thresholds								20 days
Grant of I-P Units, Fair Value of Award								$ 24,412
Class K-P Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense									$ 1,816		3,066	$ 5,557	5,392
Grant of K-P Units (in units) \| shares					220,000	64,000
K-P Units to be Granted Upon Achievement of Benchmarks (in units) \| shares									460,000
Grant of K-P Units, Fair Value of Award									$ 34,548
Class K Units Probable of Achievement (in units) \| shares									401,000
Class K-P Units [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of K-P Units (in units) \| shares					120,000
Class K-P Units [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of K-P Units (in units) \| shares					100,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award Vesting Period												4 years
Restricted Stock Units (RSUs) [Member] \| Amended Two Thousand Sixteen Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued During Period (in shares) \| shares												2,108,000
Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares												$ 119.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested									$ 251,500			$ 251,500
Restricted Stock Units (RSUs) [Member] \| Amended Two Thousand Sixteen Stock Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares												$ 111.03
Restricted Stock Units (RSUs) [Member] \| Amended Two Thousand Sixteen Stock Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares												$ 141.07
Restricted Stock Units (RSUs) [Member] \| 2006 and 2016 Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense									52,578		46,880	$ 162,341	147,352
Shares Vested During Period (in shares) \| shares												2,174,000
Shares Forfeited During Period (in shares) \| shares												164,000
Deferred Cash Compensation Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation, Vesting Period (in years)												4 years
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount										$ 96,511
Deferred Compensation Arrangement Compensation Expense									31,576		27,193	$ 97,322	85,054
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized									193,440			$ 193,440
Deferred Compensation Arrangement With Individual, Total Compensation Cost Not Yet Recognized Period For Recognition												24 months
Deferred Compensation Arrangement with Individual, Expected Payments									324,682			$ 324,682
Restricted Cash Award [Member] \| Board of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement Notice Requirement								6 months
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount								$ 35,000
Deferred Compensation Arrangement With Individual Cash Award Tranche One Vesting Amount				$ 11,000
Deferred Compensation Arrangement With Individual Cash Award Tranche Two Vesting Amount	$ 6,000	$ 6,000
Deferred Compensation Arrangement With Individual Cash Award Tranche Three Vesting Amount								$ 6,000
Awards Vesting Period \| Number_Of_Anniversaries								2
Restricted Cash Award [Member] \| Board of Directors Chairman [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount								$ 8,750
Restricted Cash Award [Member] \| Board of Directors Chairman [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount								$ 35,000
Other Deferred Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount															$ 29,500
Deferred Compensation Arrangement Compensation Expense									2,555		2,971	$ 8,076	10,124
Deferred Compensation Arrangement with Individual, Number of Installments \| Installments												5
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement Compensation Expense									7,279		$ 8,101	$ 17,725	16,516
Deferred Compensation Arrangement with Individual, Recorded Liability									26,718			$ 26,718
Employee Loans [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite Service Period (in years)												1 year
Employee Loans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Requisite Service Period (in years)												5 years
2017 Long-term Incentive Plan [Member] \| Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized									13,411			$ 13,411
Long Term Incentive Plan Performance Period (in years)												4 years
2021 Long Term Incentive Plan \| Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Cost Not Yet Recognized									$ 181,888			$ 181,888
Evercore ISI [Member] \| Class H LP Interests [Member] \| Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units Outstanding (in units) \| shares							4,148,000
Evercore ISI [Member] \| Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Number of Votes \| vote							1
Evercore ISI [Member] \| Class J LP Units [Member] \| Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues \| shares							1
Evercore ISI [Member] \| Class J LP Units [Member] \| Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense													$ 1,067
Evercore ISI [Member] \| Vested LP Units [Member] \| Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units) \| shares							1,012,000
Evercore ISI [Member] \| Vested LP Units [Member] \| Class J LP Units [Member] \| Subject to Continued Employment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units) \| shares							963,000
Evercore ISI [Member] \| Unvested LP Units [Member] \| Class J LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant of LP Units (in units) \| shares							938,000