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Condensed Consolidated Statements of Changes in Equity (Parenthetical) - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018
Class A Common Stock [Member]
Equity-based compensation and related issuance, shares			327,746
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock, shares	949,283	1,447,412
Repurchase of shares	1,613,032	1,613,032
Issuance of common stock, shares	28,484	36,935
Noncontrolling Interests in Subsidiaries [Member]
BGC's purchase of exchangeable limited partnership units in Newmark Holdings, shares			16,606,726

X

- Definition

Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock, shares.

+ References

No definition available.

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- Definition

Noncontrolling interest from subsidiary equity issuance, shares.

+ References

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- Definition

Number of new stock issued during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

+ References

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-Publisher FASB
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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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