Share-Based and Other Deferred Compensation - Additional information (Detail) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended	44 Months Ended
	Feb. 29, 2016	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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		$ 1,195,000		$ 2,188,000	$ 3,223,000	$ 3,795,000
Cash Payments Related To Separation Benefits		623,000		321,000	1,762,000	1,531,000
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement compensation expense		5,699,000		4,371,000	$ 10,531,000	8,951,000
Requisite service period (in years)					1 year
Maximum contractual term (in years)					5 years
Unamortized deferred compensation		30,509,000			$ 30,509,000
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)					$ 44.67
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)					$ 50.81
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		28,516,000		27,465,000	$ 57,278,000	54,960,000
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
Long Term Incentive Plan Payment period (in years)					2 years
Deferred compensation arrangement compensation expense		3,739,000		1,530,000	$ 7,478,000	3,043,000
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)					2,920,000
Shares vested during period (in shares)					2,205,000
Shares forfeited during period (in shares)					54,000
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			$ 38,647,000
Compensation expense related to deferred compensation programs		4,557,000		448,000	$ 7,117,000	1,008,000
Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Related To Separation Benefits				(102,000)		1,863,000
Cash Payments Related To Separation Benefits				487,000		$ 487,000
Evercore ISI [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)					16.20%	15.00%
Management Basis EBIT					$ 38,820,000	$ 32,800,000
Lexicon [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to acquisition related awards				622,000		1,237,000
Compensation expense related to deferred cash consideration				330,000		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		4,937,000		4,893,000	$ 10,550,000	9,961,000
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		15,698,000		$ 13,170,000	41,750,000	$ 33,313,000
Additional Compensation Expense Related To Acquisition Related Awards If Maximum Thresholds Were Probable		21,606,000
Life To Date Accrued Compensation Expense Related To Acquisition Related Awards		$ 83,486,000			$ 83,486,000
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								3,767,000
Remaining Compensation Expense Related To Acquisition Related Awards If Maximum Thresholds Were Probable								$ 141,922,000
Interests That Would Vest Related To Acquisition Related Awards If Maximum Thresholds Were Probable								4,957,000