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Related Party Transactions - Additional Information (Detail)													1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 20, 2020 USD ($) $ / shares shares	Mar. 02, 2020 shares	Sep. 27, 2019 USD ($)	Mar. 27, 2019 $ / shares shares	Mar. 05, 2019 $ / shares shares	Nov. 30, 2018 shares	Nov. 23, 2018 USD ($) shares	Mar. 09, 2018	Dec. 13, 2017	Oct. 25, 2016 shares	May 27, 2016 USD ($)	Jun. 05, 2015 shares	May 31, 2020 USD ($) sqrft	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Jun. 11, 2020 USD ($)	Feb. 05, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Feb. 27, 2019 USD ($)	Aug. 06, 2018 USD ($)	Mar. 19, 2018 USD ($)	Nov. 04, 2016	Aug. 31, 2013 USD ($)
Related Party Transactions [Abstract]
Commissions														$ 382,640,000	$ 422,974,000	$ 838,495,000	$ 853,156,000
Common stock, issued during the period, additional consideration							$ 0
Interest expense from affiliate														400,000	0	400,000	$ 0
Payables to Cantor related to open derivative contracts														29,960,000		29,960,000					$ 72,497,000
Employee loans														370,770,000		$ 370,770,000					315,590,000
Securities loaned																					13,902,000
Limited Partnership Units Exchange Ratio																1
Repurchase of Class A common stock, shares | shares																	233,172
Equity investment																$ 613,000	$ 735,000
Principal sum of loan due from related parties														12,255,000		12,255,000					$ 14,273,000
Aqua [Member]
Related Party Transactions [Abstract]
Increase in authorization amount for loans and investments, other credit support arrangements																				$ 2,000,000.0
Authorization amount for loans and investments, other credit support arrangements																				$ 19,200,000
Equity investment														400,000	$ 400,000	600,000
Principal sum of loan due from related parties														$ 980,000.0		$ 980,000.0
Maturity date of subordinated loan																Sep. 01, 2021
Loan Receivable, Description of Variable Rate Basis																three month LIBOR plus 600 basis points
Loan Receivable, Basis Spread on Variable Rate														6.00%		6.00%
Stephen M. Merkel [Member]
Related Party Transactions [Abstract]
Number of exchange rights grant | shares		360,065
Number of non-exchangeable LPU | shares		360,065
Shares repurchased at average price of shares | $ / shares	$ 4.0024
Number of shares redeemed, value	$ 741,644
Number of PLPU share issued for non-exchangeable | shares	265,568
Payment of withholding tax rate for common stock issue	$ 1,507,285
Number of non-exchangeable units redeemed | shares	122,579
Payment related tax for redeemed PLPU	$ 661,303
Debt Securities [Member]
Related Party Transactions [Abstract]
Purchased senior notes														$ 50,000,000.0		$ 50,000,000.0
5.125% Senior Notes Due 2021 [Member]
Related Party Transactions [Abstract]
Principal amount of debt component											$ 300,000,000.0
Stated interest rate											5.125%
3.750% Senior Notes Due October 1, 2024 [Member]
Related Party Transactions [Abstract]
Principal amount of debt component			$ 300,000,000.0
Related party expenses			$ 36,000
Stated interest rate			3.75%
Maximum [Member]
Related Party Transactions [Abstract]
Payment percentage of the gross proceeds from the sale of shares								2.00%
Maximum [Member] | Debt Securities [Member]
Related Party Transactions [Abstract]
Purchased senior notes																			$ 50,000,000.0
BGC Class B Common Stock [Member]
Related Party Transactions [Abstract]
Percentage of Distributions						100.00%
Newmark [Member]
Related Party Transactions [Abstract]
Number of shares, held by parent | shares						15,100,000
Class A Common Stock [Member]
Related Party Transactions [Abstract]
Common stock, shares issued | shares														363,848,000		363,848,000					358,440,000
Issuance of Class A common stock (net of costs), shares | shares														176,920	46,785	248,583	108,427
Repurchase of Class A common stock, shares | shares														0	0	0	233,000
Average price per share of common stock repurchased | $ / shares																	$ 5.30
Class A Common Stock [Member] | Stephen M. Merkel [Member]
Related Party Transactions [Abstract]
Number of exchangeable LPU exchanged for issuance of shares | shares		360,065
Number of shares redeemed | shares	185,300
Percentage of shares repurchased on exchangeable LPU	1.00%
Number of shares to be repurchased | shares				250,000
Repurchase of Class A common stock, shares | shares				233,172
Average price per share of common stock repurchased | $ / shares				$ 5.30
Class A Common Stock [Member] | Mr. Lutnick [Member] | Retirement Plan [Member]
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs), shares | shares					8,980
Share Price | $ / shares					$ 6.24
Class A Common Stock [Member] | Maximum [Member] | Mr. Lutnick [Member] | Retirement Plan [Member]
Related Party Transactions [Abstract]
Value of common stock to be issued																						$ 56,038
Class A Common Stock [Member] | Newmark [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares						9,400,000
Class A Common Stock [Member] | Newmark OpCo [Member]
Related Party Transactions [Abstract]
Number of shares, held by parent | shares						7,000,000.0
Number of shares, right to exchange from Class A to Class B common stock | shares						6,900,000
Class B Common Stock [Member]
Related Party Transactions [Abstract]
Common stock, shares issued | shares														45,884,000		45,884,000					45,884,000
Issuance of Class A common stock (net of costs), shares | shares														0	0	0	0
Class B Common Stock [Member] | Newmark [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares						5,400,000
Class B Units [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Purchase of units | shares										9,000
Percentage of outstanding common stock owned by parent																									100.00%
Newmark [Member] | LPUs [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units purchased | shares						1,500,000
Newmark [Member] | Class A Common Stock [Member]
Related Party Transactions [Abstract]
Spin-off received on per share						0.463895
Aggregate distribution of shares | shares						131,900,000
Common stock, shares issued | shares						131,886,409
Newmark [Member] | Class B Common Stock [Member]
Related Party Transactions [Abstract]
Spin-off received on per share						0.463895
Aggregate distribution of shares | shares						21,300,000
Percentage of Distributions						100.00%
Common stock, shares issued | shares						21,285,537
Exchange ratio						0.9366										0.9366
Tower Bridge International Services LP [Member] | BGC Partners, Inc. [Member]
Related Party Transactions [Abstract]
Company ownership of Tower Bridge																52.00%
Tower Bridge International Services LP [Member] | Cantor [Member]
Related Party Transactions [Abstract]
Noncontrolling interest														48.00%		48.00%
Aqua [Member] | BGC Partners, Inc. [Member]
Related Party Transactions [Abstract]
Percentage of ownership interest														49.00%		49.00%
Equity investment																	$ 700,000
Aqua [Member] | Cantor [Member]
Related Party Transactions [Abstract]
Investment ownership percentage														51.00%		51.00%
Cantor [Member]
Related Party Transactions [Abstract]
Mark-up cost of services																7.50%
Cantor's share of net profit in Tower Bridge														$ 400,000	$ 600,000	$ 200,000	300,000
Recognized related party revenues														6,600,000	7,200,000	12,100,000	13,000,000.0
Service charges														15,200,000	14,900,000	31,100,000	27,800,000
Compensation to leased employees														10,100,000	8,400,000	20,600,000	18,400,000
Repurchase agreements														0		0					$ 0
Recognition of share of FX gains (losses)														(800,000)	700,000	(200,000)	900,000
Commissions														9,000	69,000	84,000	147,000
Investment in asset-backed commercial paper program														0		0					0
Investment authorization in asset-backed commercial paper program																										$ 350,000,000.0
Reverse purchase agreement outstanding														$ 0		$ 0					0
Founding partner units remaining | shares														2,129,969		2,129,969
Cantor [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Recognized related party revenues														$ 200,000	200,000	$ 300,000	300,000
Cantor [Member] | Revolving Credit Facility [Member]
Related Party Transactions [Abstract]
Principal amount of debt component																							$ 400,000,000.0	$ 250,000,000.0
Credit agreement, description																The BGC Credit Agreement will mature on the earlier to occur of (a) March 19, 2021, after which the maturity date of the BGC Credit Agreement will continue to be extended for successive one-year periods unless prior written notice of non-extension is given by a lending party to a borrowing party at least six months in advance of such renewal date and (b) the termination of the BGC Credit Agreement by either party pursuant to its terms.
Credit agreement, interest rate description																The outstanding amounts under the BGC Credit Agreement will bear interest for any rate period at a per annum rate equal to the higher of BGC’s or Cantor’s short-term borrowing rate in effect at such time plus 1.00%
Line of credit facility, outstanding amount														$ 0		$ 0					0
Interest income from affiliate															$ 0		$ 0
Cantor [Member] | Newmark [Member] | Class A Common Stock [Member]
Related Party Transactions [Abstract]
Common stock, shares issued | shares						400,000
CF & Co [Member]
Related Party Transactions [Abstract]
Payment percentage of the gross proceeds from the sale of shares									5.50%
Issuance of Class A common stock (net of costs), shares | shares														0	0	200,000	900,000
Aggregate proceeds from issuance of common stock																$ 700,000	$ 5,300,000
Weighted-average price per share | $ / shares																$ 4.04	$ 6.17
Related party expenses																$ 7,000	$ 100,000
Securities loaned														$ 0		0					$ 13,900,000
Stated interest rate																					2.45%
Guarantee fees														31,000	$ 31,000	63,000	63,000
CF & Co [Member] | 5.125% Senior Notes Due 2021 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses											$ 500,000
Purchased senior notes														$ 15,000,000.0		$ 15,000,000.0
CF & Co [Member] | 3.750% Senior Notes Due October 1, 2024 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses			$ 200,000
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member]
Related Party Transactions [Abstract]
Securities loaned																					$ 13,900,000
CF & Co [Member] | Class A Common Stock [Member]
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs), shares | shares														0
CF Group Management, Inc. [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares							712,907					34,649,693				23,600,000
Cantor Rights to Purchase Exchangeable Units [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares							10,323,366
Cantor Rights to Purchase Exchangeable Units [Member] | Maximum [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares												34,649,693				23,600,000
Cantor Rights to Purchase Exchangeable Units [Member] | Class B Common Stock [Member] | Maximum [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares																23,613,420
Cantor and CFGM [Member] | Class B Common Stock [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares																23,613,420
Cantor and CFGM [Member] | Newmark [Member] | Class A Common Stock [Member]
Related Party Transactions [Abstract]
Common stock, shares issued | shares						449,917
Cantor and Freedom [Member]
Related Party Transactions [Abstract]
Receivables from Freedom														$ 1,900,000		$ 1,900,000					1,300,000
Receivables from Cantor related to open derivative contracts														600,000		600,000					1,300,000
Payables to Cantor related to open derivative contracts														200,000		200,000					2,000,000.0
Payables to Cantor related to pending equity trades														2,000,000.0		2,000,000.0					2,300,000
Employee Loans [Member]
Related Party Transactions [Abstract]
Employee loans														370,800,000		370,800,000					315,600,000
Compensation expense related to employee loans														17,100,000	7,400,000	31,600,000	14,000,000.0
Interest income														1,200,000	$ 1,000,000.0	2,400,000	$ 2,000,000.0
Castle Oak | 5.125% Senior Notes Due 2021 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses											$ 18,000
Cantor Fitzgerald Relief Fund [Member] | Accounts Payable and Accrued Liabilities
Related Party Transactions [Abstract]
Charitable contributions														4,500,000		4,500,000					$ 4,000,000.0
Cantor Fitzgerald Relief Fund [Member] | Other Expenses [Member]
Related Party Transactions [Abstract]
Charitable contributions																		$ 40,000,000.0
RKF Retail Holdings LLC [Member]
Related Party Transactions [Abstract]
Lessee operating lease sublease term													1 year
Area of sublease | sqrft													21,000
Lessee operating sublease description													In May 2020, BGC U.S. OpCo entered into an arrangement to sublease excess space from RKF Retail Holdings LLC, a subsidiary of Newmark, which sublease was approved by the Audit Committee. The deal is a one-year sublease of approximately 21,000 rentable square feet in New York City.
BGC U.S OpCo [Member]
Related Party Transactions [Abstract]
Rent payment under lease term													$ 1,100,000	$ 100,000		$ 100,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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