Share-Based and Other Deferred Compensation - Additional information (Detail) $ / shares in Units, £ in Thousands	1 Months Ended		3 Months Ended					12 Months Ended
	Feb. 29, 2016 shares	Feb. 28, 2015 GBP (£) shares	Mar. 31, 2016 USD ($) shares	Dec. 31, 2013 shares	Jun. 30, 2013 shares	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2011 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital | $								$ 12,833,000	$ 16,254,000
Restricted Class A Shares, Transfer Restrictions Released (in shares)				610,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized					5,000,000
LP Units, Transfer Restrictions Released (in LP units)				1,267,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $								36,755,000	34,375,000	$ 29,497,000
Expense Related To Separation Benefits | $								6,766,000	5,671,000	4,834,000
Cash Payments Related To Separation Benefits | $								3,805,000	3,415,000	3,314,000
Employee Loans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation arrangement compensation expense | $								$ 14,564,000	$ 13,851,000	$ 7,433,000
Requisite service period (in years)								1 year
Maximum contractual term (in years)								5 years
Unamortized deferred compensation | $								$ 24,311,000
Two Thousand Six Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant								2,865,000	5,392,000
Shares issued during period (in shares)								2,712,000
Shares vested during period (in shares)								2,259,000
Shares forfeited during period (in shares)								167,000
Two Thousand Six Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $								$ 140,709,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition								20 months
Shares issued during period (in shares)								2,712,000	2,071,000	2,398,000
Shares vested during period (in shares)								2,259,000	3,245,000	2,188,000
Shares forfeited during period (in shares)								167,000	158,000	60,000
Compensation expense related to Service-based Award | $								$ 105,496,000	$ 90,597,000	$ 79,678,000
Two Thousand Six Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [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								$ 48.41	$ 46.59	$ 26.60
Two Thousand Six Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [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								$ 58.47	$ 58.67	$ 55.24
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 | $								$ 6,192,000	$ 5,700,000	$ 1,584,000
Class A [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number								141,000
Class A [Member] | Two Thousand Six Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Authorized Under Plan								20,000,000
LP Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Original Grant Of Vested LP Units (in units)								13,548,000
Original Grant Of Unvested LP Units (in units)								9,589,000
Limited Partnership Units Convertible Conversion Ratio								1
Amortization Of LP Units | $										20,063,000
Deferred Cash Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $								$ 126,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition								1 month
Grant Of Deferred Cash Compensation | $						$ 3,926,000	$ 9,153,000
Deferred compensation, vesting period (in years)								4 years
Compensation expense related to deferred compensation programs | $								$ 1,476,000	3,683,000	3,804,000
Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Related To Separation Benefits | $								1,863,000	3,372,000
Cash Payments Related To Separation Benefits | $								$ 487,000	238,000
Evercore ISI [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Management Basis EBIT Margin (as a percent)								15.20%
Management Basis EBIT | $								$ 34,395,000
Evercore ISI [Member] | Acquisition Related [Member] | Unvested Acquisition Related Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $								$ 237,767,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition								38 months
Lexicon [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period (in shares)								5,000
Shares vested during period (in shares)								465,000
Shares forfeited during period (in shares)								0
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	5,255,000	10,960,000
Compensation expense related to deferred cash consideration | $								$ 301,000	$ 1,626,000	3,937,000
Grant Of Acquisition Related Deferred Compensation | $											$ 1,892,000
Deferred Compensation Vesting Period											2 years
Expense Related To Acquisition Related Deferred Compensation | $										$ 211,000
Deferred Cash Consideration Transfer Restrictions Released | £		£ 3,190
Lexicon [Member] | Acquisition Related [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares											1,883,000
Restricted Class A Shares, Transfer Restrictions Released (in shares)		531,000
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]
Shares issued during period (in shares)								0
Shares vested during period (in shares)								399,000
Shares forfeited during period (in shares)								0
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 | $								$ 21,425,000	$ 3,399,000
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 issued during period (in shares)								12,000
Shares vested during period (in shares)								7,000
Shares forfeited during period (in shares)								0
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 H Interests [Member] | Evercore ISI [Member] | Acquisition Related [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period (in shares)								44,000
Shares vested during period (in shares)								28,000
Shares forfeited during period (in shares)								0
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 | $								$ 61,111,000
Subsequent Event [Member] | Other Share Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period (in shares)			2,600,000
Awards Vesting Period			4 years
Subsequent Event [Member] | Other Deferred Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Of Deferred Cash Compensation | $			$ 40,000,000
Subsequent Event [Member] | 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)	373,000
Atalanta Sosnoff [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital | $								6,333,000	$ 269,000
Atalanta Sosnoff [Member] | Special Charges [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion of Profits Interests Charge | $								$ 6,333,000