Cover - shares	3 Months Ended
	Mar. 31, 2023	May 05, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	0-28191
Entity Registrant Name	BGC Partners, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-4063515
Entity Address, Address Line One	499 Park Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10022
City Area Code	212
Local Phone Number	610-2200
Title of 12(b) Security	Class A Common Stock, $0.01 par value
Trading Symbol	BGCP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001094831
Current Fiscal Year End Date	--12-31
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		338,487,099
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		45,884,380