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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares	1 Months Ended		3 Months Ended
	Mar. 31, 2021	Feb. 28, 2021	Mar. 31, 2021	Mar. 31, 2020
Share issuances:
Treasury stock repurchases	(3,000)	(962,000)	(965,000)
Class A Common Stock [Member]
Class of Stock [Line Items]
Shares outstanding at beginning of period			323,018,000	307,915,000
Share issuances:
Redemptions/Exchanges of limited partnership interests			10,430,945	2,105,401
Vesting of RSUs			1,367,000	697,000
Acquisitions			251,000	270,000
Other issuances of BGC Class A common stock			262,000	72,000
Treasury stock repurchases			(964,471)	0
Shares outstanding at end of period	334,364,000		334,364,000	311,059,000

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Number of shares issued during the period related to redemptions and exchanges of limited partnership interests.

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Stock issued during period shares restricted stock award vested.

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