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Evercore Inc. Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared Per Share of Class A Common Stock (in dollars per share) |  | $ 0.61 | $ 0.58 | $ 0.58 | $ 0.58 | $ 0.58 | $ 0.58 | $ 0.58 | $ 0.50 | $ 2.35 | $ 2.24 |  |  |
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 2.35 | $ 2.24 |  |  |
Declared and Paid Dividends, Cash |  |  |  |  |  |  |  |  |  | $ 95,226 | $ 89,407 |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  |  | 1,922 | 3,399 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 76.25 | $ 83.28 |  |  |
Increase in Treasury Stock |  |  |  |  |  |  |  |  |  | $ 146,559 | $ 283,081 |  |  |
LP Units Exchanged By Employees (in units) |  |  |  |  |  |  |  |  |  | 899 | 353 |  |  |
Increase in Common Stock |  |  |  |  |  |  |  |  |  | $ 9 | $ 3 |  |  |
Adjustments to Additional Paid-In-Capital |  |  |  |  |  |  |  |  |  | 37,674 | 15,138 |  |  |
Accumulated Unrealized Gain (Loss) on Securities and Investments |  | $ (5,287) |  |  |  |  |  |  |  | (5,287) |  |  |  |
Foreign Currency Translation Adjustment Gain (Loss), Net |  | (4,471) |  |  |  |  |  |  |  | (4,471) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  | 20,337 |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | 1,489,374 |  |  |  | $ 1,126,250 |  |  |  | 1,489,374 | 1,126,250 | $ 1,007,939 |  | $ 796,368
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ (9,758) |  |  |  | $ (27,596) |  |  |  | $ (9,758) | $ (27,596) | $ (30,434) |  | $ (31,411)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,229 |
Share Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  |  | 854 | 2,360 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 75.93 | $ 80.69 |  |  |
Share Repurchase Program [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Market Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | 58.28 | 73.18 |  |  |
Share Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Market Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 81.96 | $ 92.33 |  |  |
Net Settlement of Share Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  |  | 1,068 | 1,039 |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 76.51 | $ 89.15 |  |  |
Net Settlement of Share Based Awards [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Market Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | 38.23 | 71.11 |  |  |
Net Settlement of Share Based Awards [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock Acquired, Market Value Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 104.38 | $ 96.22 |  |  |
Dividends Accrued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Deferred Cash Dividends |  |  |  |  |  |  |  |  |  | $ 13,734 | $ 14,642 |  |  |
Dividend Paid [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued Deferred Cash Dividends |  |  |  |  |  |  |  |  |  | $ 11,356 | $ 7,396 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Declared Per Share of Class A Common Stock (in dollars per share) | $ 0.61 |  |  |  |  |  |  |  |  |  |  |  |  |

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