Evercore Inc. (Parent Company Only) Financial Statements - Additional Information (Details)		1 Months Ended	3 Months Ended								12 Months Ended
	Mar. 30, 2016 USD ($)	Nov. 30, 2016	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares shares	Sep. 30, 2016 $ / shares	Jun. 30, 2016 $ / shares	Mar. 31, 2016 $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares
Condensed Financial Statements, Captions [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares											3,916,000	3,475,000
Increase in Treasury Stock											$ 293,753,000	$ 167,241,000
Dividends Declared per Share of Class A Common Stock (in dollars per share) | $ / shares			$ 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) | $ / shares											$ 1.42	$ 1.27
Declared and Paid Dividends											$ 56,521,000	$ 51,558,000
Dividends, Share-based Compensation, Cash											9,815,000
Adjustments to Tax Receivable Agreements											77,535,000	$ 0	$ 0
Contractual Obligations Related To Tax Receivable Agreements			$ 103,196,000								103,196,000
Payment To Counterparties To Tax Receivable Agreement Within One Year Or Less			12,821,000								12,821,000
Payment To Counterparties To Tax Receivable Agreement One To Three Years			17,421,000								17,421,000
Payment To Counterparties To Tax Receivable Agreement Three To Five Years			18,437,000								18,437,000
Payment To Counterparties To Tax Receivable Agreement After Five Years			$ 54,517,000								$ 54,517,000
Minimum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 50.90	$ 44.30
Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 90.50	$ 70.65
Share Repurchase Program [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares											2,757,000	2,388,000
Share Repurchase Program [Member] | Minimum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 67.37	$ 44.59
Share Repurchase Program [Member] | Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 78.81	$ 52.74
Net Settlement of Share Based Awards [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares											1,159,000	1,087,000
Class A [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock, Shares Authorized | shares			1,000,000,000				1,000,000,000				1,000,000,000	1,000,000,000
Common Stock, Par Value (in dollars per share) | $ / shares			$ 0.01				$ 0.01				$ 0.01	$ 0.01
Common Stock, Shares Issued | shares			62,119,904				58,292,567				62,119,904	58,292,567
Class B [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock, Shares Authorized | shares			1,000,000				1,000,000				1,000,000	1,000,000
Common Stock, Par Value (in dollars per share) | $ / shares			$ 0.01				$ 0.01				$ 0.01	$ 0.01
Common Stock, Shares Issued | shares			82				24				82	24
LP Units [Member]
Condensed Financial Statements, Captions [Line Items]
Limited Partnership Units Convertible Conversion Ratio		1									1
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends Declared per Share of Class A Common Stock (in dollars per share) | $ / shares											$ 1.42
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share) | $ / shares											$ 1.42
Declared and Paid Dividends											$ 56,521,000
Dividends, Share-based Compensation, Cash											9,815,000
Adjustments to Tax Receivable Agreements											77,535,000	$ 0	$ 0
Contractual Obligations Related To Tax Receivable Agreements			$ 103,196,000								103,196,000
Payment To Counterparties To Tax Receivable Agreement Within One Year Or Less			12,821,000								12,821,000
Payment To Counterparties To Tax Receivable Agreement One To Three Years			17,421,000								17,421,000
Payment To Counterparties To Tax Receivable Agreement Three To Five Years			18,437,000								18,437,000
Payment To Counterparties To Tax Receivable Agreement After Five Years			54,517,000								54,517,000
Parent Company [Member] | Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Extinguishment of Debt, Amount	$ 120,000,000
Parent Company [Member] | Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Gross	170,000,000
Long Term Debt Maturities Repayments Of Principal And Interest			228,080,000								228,080,000
Long Term Debt Maturities Repayments Of Principal And Interest In Next Twelve Months			8,937,000								8,937,000
Long Term Debt Maturities Repayments Of Principal And Interest In One To Three Years			17,874,000								17,874,000
Long Term Debt Maturities Repayments Of Principal And Interest In Three To Five Years			53,093,000								53,093,000
Long Term Debt Maturities Repayments Of Principal And Interest After Five Years			$ 148,176,000								$ 148,176,000
Parent Company [Member] | Series A Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Gross	$ 38,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.88%
Parent Company [Member] | Series B Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Gross	$ 67,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.23%
Parent Company [Member] | Series C Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Gross	$ 48,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.48%
Parent Company [Member] | Series D Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Long-term Debt, Gross	$ 17,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.58%
Parent Company [Member] | Class A [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock, Shares Authorized | shares			1,000,000,000				1,000,000,000				1,000,000,000	1,000,000,000
Common Stock, Par Value (in dollars per share) | $ / shares			$ 0.01				$ 0.01				$ 0.01	$ 0.01
Common Stock, Shares Issued | shares			62,119,904				58,292,567				62,119,904	58,292,567
Increase in Treasury Stock											$ 293,753,000
Parent Company [Member] | Class A [Member] | Minimum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 50.90
Parent Company [Member] | Class A [Member] | Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 90.50
Parent Company [Member] | Class A [Member] | Share Repurchase Program [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares											2,757,000
Parent Company [Member] | Class A [Member] | Share Repurchase Program [Member] | Minimum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 67.37
Parent Company [Member] | Class A [Member] | Share Repurchase Program [Member] | Maximum [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock Acquired, Market Value Per Share (in dollars per share) | $ / shares											$ 78.81
Parent Company [Member] | Class A [Member] | Net Settlement of Share Based Awards [Member]
Condensed Financial Statements, Captions [Line Items]
Treasury Stock, Shares, Acquired (in shares) | shares											1,159,000
Parent Company [Member] | Class B [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock, Shares Authorized | shares			1,000,000				1,000,000				1,000,000	1,000,000
Common Stock, Par Value (in dollars per share) | $ / shares			$ 0.01				$ 0.01				$ 0.01	$ 0.01
Common Stock, Shares Issued | shares			82				24				82	24
Common Stock Shares Cancelled | shares			6								6