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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share issuances:
Treasury stock repurchases				(233,172)
Class A Common Stock [Member]
Class of Stock [Line Items]
Shares outstanding at beginning of period	311,059,000	293,382,000	307,915,000	291,475,000
Share issuances:
Redemptions/Exchanges of limited partnership interests	1,968,788	3,879,468	4,074,189	5,700,056
Vesting of RSUs	103,000	81,000	800,000	322,000
Acquisitions	15,000	481,000	285,000	499,000
Other issuances of BGC Class A common stock	177,000	47,000	249,000	108,000
Treasury stock repurchases	0	0	0	(233,000)
Shares outstanding at end of period	313,323,000	297,871,000	313,323,000	297,871,000

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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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