Evercore Inc. Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 29, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Temporary Equity [Line Items]
Dividends Declared Per Share of Class A Common Stock (in dollars per share)		$ 0.40	$ 0.34	$ 0.34	$ 0.34	$ 0.34	$ 0.31	$ 0.31	$ 0.31	$ 1.42	$ 1.27	$ 1.15
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)										$ 1.42	$ 1.27
Declared and Paid Dividends										$ 56,521	$ 51,558
Dividends, Share-based Compensation, Cash										$ 9,815
Treasury Stock, Shares, Acquired (in shares)										3,916	3,475
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)										$ 74.99	$ 48.03
Increase in Treasury Stock										$ 293,753	$ 167,241
LP Units Exchanged By Employees (in units)										1,213	532
Increase in Common Stock										$ 12	$ 5
Adjustments to Additional Paid-In-Capital										44,729	$ 16,242
Accumulated Unrealized Gain (Loss) on Marketable Securities		$ (5,522)								(5,522)
Foreign Currency Translation Adjustment Gain (Loss), Net		$ (25,889)								(25,889)
G5 [Member]
Temporary Equity [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax										$ 16,266
Share Repurchase Program [Member]
Temporary Equity [Line Items]
Treasury Stock, Shares, Acquired (in shares)										2,757	2,388
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)										$ 73.75	$ 48.21
Minimum [Member]
Temporary Equity [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share)										50.90	44.30
Minimum [Member] | Share Repurchase Program [Member]
Temporary Equity [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share)										67.37	44.59
Maximum [Member]
Temporary Equity [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share)										90.50	70.65
Maximum [Member] | Share Repurchase Program [Member]
Temporary Equity [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share)										$ 78.81	$ 52.74
Net Settlement of Share Based Awards [Member]
Temporary Equity [Line Items]
Treasury Stock, Shares, Acquired (in shares)										1,159	1,087
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)										$ 77.95	$ 47.63
Subsequent Event [Member]
Temporary Equity [Line Items]
Dividends Declared Per Share of Class A Common Stock (in dollars per share)	$ 0.40