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Share-Based and Other Deferred Compensation - Additional information (Detail) $ / shares in Units, £ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
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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 |  |  |

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