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Related Party Transactions - Additional Information (Detail)																										1 Months Ended	3 Months Ended								12 Months Ended
	Aug. 06, 2020 USD ($) $ / shares shares	Aug. 05, 2020 USD ($) $ / shares shares	Jul. 30, 2020 USD ($) $ / shares shares	Jul. 10, 2020 USD ($)	Mar. 20, 2020 USD ($) $ / shares shares	Mar. 02, 2020 USD ($) shares	Sep. 27, 2019 USD ($)	Mar. 27, 2019 $ / shares shares	Mar. 05, 2019 $ / shares shares	Feb. 22, 2019 USD ($) $ / shares shares	Feb. 01, 2019 USD ($) $ / shares shares	Nov. 30, 2018 shares	Nov. 23, 2018 USD ($) shares	Oct. 03, 2018 $ / shares shares	Jul. 24, 2018 USD ($)	Mar. 11, 2018 USD ($) $ / shares shares	Mar. 09, 2018	Mar. 07, 2018 USD ($) $ / shares shares	Feb. 26, 2018 $ / shares shares	Dec. 13, 2017 USD ($)	Apr. 12, 2017	Nov. 04, 2016 USD ($)	Oct. 25, 2016 shares	May 27, 2016 USD ($)	Jun. 05, 2015 shares	May 31, 2020 USD ($) sqrft	Dec. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Feb. 25, 2021 USD ($)	Aug. 14, 2020 USD ($)	Jun. 11, 2020 USD ($)	Feb. 05, 2020 USD ($)	Feb. 27, 2019 USD ($)	Aug. 06, 2018 USD ($)	Mar. 19, 2018 USD ($)	Feb. 16, 2018 USD ($)	Aug. 31, 2013 USD ($)
Related Party Transactions [Abstract]
Cantor's share of net profit (loss) in Tower Bridge																																			$ 7,694,000	$ 24,691,000	$ 31,293,000
Payment percentage of the gross proceeds from the sale of shares																	2.00%				2.00%
Commissions																											$ 377,146,000	$ 352,027,000	$ 382,640,000	$ 455,855,000	$ 382,897,000	$ 409,765,000	$ 422,974,000	$ 430,182,000	1,567,668,000	1,645,818,000	1,511,522,000
Common stock, issued during the period, additional consideration													$ 0
Interest expense from affiliate																																			400,000	0	3,900,000
Payables to Cantor related to open derivative contracts																											36,252,000				72,497,000				36,252,000	72,497,000
Employee loans																											408,142,000				315,590,000				$ 408,142,000	315,590,000
Aggregate proceeds from issuance of common stock																																					327,624,000
Securities loaned																															13,902,000					13,902,000
Limited Partnership Units Exchange Ratio																																			1
Repurchase of Class A common stock, shares | shares																												2,000							2,000
Issuance of Class A common stock (net of costs)																																			$ 5,505,000	1,116,000	312,842,000
Equity investment																																			1,458,000	1,715,000	$ 925,000
Receivables from related parties																											11,953,000				14,273,000				11,953,000	14,273,000
Receivables from related parties																											11,953,000				$ 14,273,000				11,953,000	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																																										$ 20,200,000
Equity investment																																			1,500,000	$ 1,700,000
Receivables from related parties																											$ 980,000.0								$ 980,000.0
Maturity date of subordinated loan																																			Sep. 01, 2022
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%
Receivables from related parties																											$ 980,000.0								$ 980,000.0
Aqua [Member] | Subsequent Event [Member]
Related Party Transactions [Abstract]
Increase in authorization amount for loans and investments, other credit support arrangements																																							$ 1,000,000.0
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			142,989		122,579
Payment related tax for redeemed PLPU			$ 846,182		$ 661,303
Shaun D. Lynn [Member]
Related Party Transactions [Abstract]
Number of exchange rights grant | shares						883,348
Number of non-exchangeable LPU | shares						883,348
Number of PLPU share issued for non-exchangeable | shares						245,140
Payment of withholding tax rate for common stock issue						$ 1,099,599
Number of non-exchangeable units redeemed | shares			221,239
Payment related tax for redeemed PLPU			$ 992,388
Number of remaining exchangeable LPUs | shares			86,126
Number of exchangeable PLPUs | shares			23,901
Payment related to exchangeable LPUs and PLPUs redeemed upon exchange in connection with LLP status			$ 0
Sean A. Windeatt [Member]
Related Party Transactions [Abstract]
Number of exchange rights grant | shares						519,725
Number of non-exchangeable LPU | shares						519,725
Number of shares redeemed | shares		20,849
Number of PLPU share issued for non-exchangeable | shares						97,656
Payment of withholding tax rate for common stock issue						$ 645,779
Number of non-exchangeable units redeemed | shares		96,216
Payment related tax for redeemed PLPU		$ 637,866
Number of exchangeable PLPUs | shares		1,440
Payment related to exchangeable LPUs and PLPUs redeemed upon exchange in connection with LLP status		$ 0
Mr. Windeatt [Member]
Related Party Transactions [Abstract]
Number of exchange rights grant | shares		40,437
Number of non-exchangeable LPU | shares	43,890	40,437
Number of shares redeemed | shares	3,681
Number of PLPU share issued for non-exchangeable | shares	17,068	21,774
Payment related tax for redeemed PLPU	$ 194,086
Number of exchangeable PLPUs | shares	1,431	21,774
Payment related to exchangeable LPUs and PLPUs redeemed upon exchange in connection with LLP status	$ 0	$ 136,305
Transaction charge of grant of exchangeability	$ 381,961
Mr. Merkel [Member]
Related Party Transactions [Abstract]
Share Price | $ / shares																																					$ 5.17
Number of non-exchangeable PSU approved cancellation | shares																																					113,032
Number of non-exchangeable PPSU approved cancellation | shares																																					89,225
Determination price | $ / shares																																					$ 5.36
Number of shares issued for non-exchangeable units | shares																																					1,062,500
Number of shares issued for non-exchangeable units, net | shares																																					113,032
Percentage of withholding tax rate for common shares issued																																					45.00%
Payment related to withholding tax rate for common shares issued																																					$ 478,123
Mr. Lutnick [Member] | Preferred Units [Member]
Related Party Transactions [Abstract]
Number of PLPU share issued for non-exchangeable | shares											463,969
Payment of withholding tax rate for common stock issue											$ 2,661,000
Number of non-exchangeable units redeemed | shares											376,651																										760,797
Exchange share price | $ / shares											$ 6.21
Determination price | $ / shares																																					$ 6.57
Non-exchangeable units redemption, value																																					$ 5,000,000
Number of non-exchangeable PSU approved redemption | shares											376,651
Number of LPU issued on exchangeable											$ 2,339,000
Mr. Windeatt [Member] | U.K. [Member]
Related Party Transactions [Abstract]
Number of PLPU share issued for non-exchangeable | shares										9,495																											63,814
Payment of withholding tax rate for common stock issue										$ 53,606																											$ 280,002
Exchange share price | $ / shares										$ 6.26																											$ 5.17
Determination price | $ / shares										$ 5.6457																											$ 4.388
Number of LPU issued on exchangeable										$ 137,845																											$ 720,000
Number of non-exchangeable LPU redemption | shares										22,020																											139,265
Mr. Lynn [Member] | U.K. [Member]
Related Party Transactions [Abstract]
Number of PLPU share issued for non-exchangeable | shares										25,461																											287,888
Payment of withholding tax rate for common stock issue										$ 105,000																											$ 1,120,909
Exchange share price | $ / shares										$ 6.26																											$ 5.17
Determination price | $ / shares										$ 4.1239																											$ 3.894
Number of non-exchangeable PSU approved redemption | shares										43,131																											750,308
Number of LPU issued on exchangeable										$ 270,000																											$ 3,879,092
Debt Securities [Member]
Related Party Transactions [Abstract]
Purchased senior notes																											50,000,000.0								50,000,000.0
Debt repurchase amount																											$ 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%
Principal amount of notes																								$ 300,000,000.0
5.375% Senior Notes Due 2023 [Member]
Related Party Transactions [Abstract]
Principal amount of debt component															$ 450,000,000.0
Stated interest rate															5.375%
Principal amount of notes															$ 450,000,000.0
3.750% Senior Notes Due October 1, 2024 [Member]
Related Party Transactions [Abstract]
Principal amount of debt component							$ 300,000,000.0
Stated interest rate							3.75%
Principal amount of notes							$ 300,000,000.0
4.375% Senior Notes [Member]
Related Party Transactions [Abstract]
Principal amount of debt component				$ 300,000,000.0
Stated interest rate				4.375%																							4.375%				4.375%				4.375%	4.375%
Principal amount of notes				$ 300,000,000.0
5.125% Senior Notes [Member]
Related Party Transactions [Abstract]
Principal amount of debt component																								300,000,000.0
Stated interest rate																											5.125%				5.125%				5.125%	5.125%				5.125%
Principal amount of notes																								300,000,000.0
14.66% Senior Notes [Member]
Related Party Transactions [Abstract]
Principal amount of debt component																																								$ 44,000,000.0
Stated interest rate																																								14.66%
Principal amount of notes																																								$ 44,000,000.0
Maximum [Member] | Debt Securities [Member]
Related Party Transactions [Abstract]
Purchased senior notes																																									$ 50,000,000.0
Debt repurchase amount																																									$ 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
Newmark [Member] | LPUs [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units purchased | shares																		16,600,000
Aggregate consideration amount																		$ 242,000,000.0
Number of interest units owned in limited partnership | shares																											7,000,000.0								7,000,000.0
Class A Common Stock [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares																																					11,036,273
Common stock, shares issued | shares																											373,545,000				358,440,000				373,545,000	358,440,000
Issuance of Class A common stock (net of costs), shares | shares																																			390,570	212,711	26,003,424
Repurchase of Class A common stock, shares | shares																																			2,259	233,172	788,788
Average price per share of common stock repurchased | $ / shares																																			$ 2.58	$ 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			174,765		185,300
Percentage of shares repurchased on exchangeable LPU					1.00%
Exchange share price | $ / shares			$ 2.76
Class A Common Stock [Member] | Shaun D. Lynn [Member]
Related Party Transactions [Abstract]
Number of exchangeable LPU exchanged for issuance of shares | shares						883,348
Number of shares redeemed | shares			797,222
Exchange share price | $ / shares			$ 2.76
Class A Common Stock [Member] | Sean A. Windeatt [Member]
Related Party Transactions [Abstract]
Number of exchangeable LPU exchanged for issuance of shares | shares						519,725
Number of shares redeemed | shares		436,665
Exchange share price | $ / shares		$ 2.90
Class A Common Stock [Member] | Mr. Windeatt [Member]
Related Party Transactions [Abstract]
Number of exchangeable LPU exchanged for issuance of shares | shares	37,660	40,437
Number of shares redeemed | shares	40,209	40,437
Shares repurchased at average price of shares | $ / shares		$ 2.90
Exchange share price | $ / shares	$ 4.16
Number of exchangeable PLPUs | shares	15,637
Class A Common Stock [Member] | Mr. Merkel [Member]
Related Party Transactions [Abstract]
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]
Share Price | $ / shares									$ 6.24										$ 13.17
Issuance of Class A common stock (net of costs), shares | shares									8,980										7,883
Class A Common Stock [Member] | Mr. Lutnick [Member] | Charitable Foundation [Member]
Related Party Transactions [Abstract]
Share Price | $ / shares														$ 11.73
Number of shares repurchased from charitable foundation | shares														53,368
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			$ 105,000
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 [Member] | LPUs [Member]
Related Party Transactions [Abstract]
Share Price | $ / shares																		$ 14.57
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	45,884,000
Issuance of Class A common stock (net of costs), shares | shares																																			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
BGC Class A Common Stock [Member] | Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Share Price | $ / shares																$ 14.33
Issuance of Class A common stock (net of costs), shares | shares																979,344
Issuance of Class A common stock (net of costs)																$ 30,000,000.0
BGC Class A Common Stock [Member] | BGC Holdings [Member] | Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Number of non-exchangeable PSU approved redemption | shares																1,637,215
Number of non-exchangeable LPU redemption | shares																2,348,479
Number of non-exchangeable PPSU approved redemption | shares																711,264
BGC Class A Common Stock [Member] | Newmark Holdings [Member] | Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Number of non-exchangeable PSU approved redemption | shares																774,566
Number of non-exchangeable PPSU approved redemption | shares																336,499
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																																			0.9379
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%
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 (loss) in Tower Bridge																																			$ 800,000	$ 3,100,000	$ 1,100,000
Recognized related party revenues																																			25,800,000	29,400,000	24,100,000
Service charges																																			62,600,000	59,100,000	52,400,000
Compensation to leased employees																																			39,400,000	39,800,000	32,200,000
Repurchase agreements																											$ 0				$ 0				0	0
Recognition of share of FX gains (losses)																																			1,500,000	300,000	(1,600,000)
Commissions																																			100,000	200,000	300,000
Investment in asset-backed commercial paper program																											0				0				0	0
Investment authorization in asset-backed commercial paper program																																															$ 350,000,000.0
Reverse purchase agreement outstanding																											$ 0				0				$ 0	0
Founding partner units remaining | shares																											2,700,000								2,700,000
Receivables from related parties																				$ 4,500,000
Recognized related party revenues																																			$ 25,800,000	29,400,000	24,100,000
Receivables from related parties																				$ 4,500,000
Cantor [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Recognized related party revenues																																			700,000	400,000	800,000
Recognized related party revenues																																			$ 700,000	400,000	800,000
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	0									150,000,000.0
Interest expense related discontinued operation																																			3,500,000
Principal amount of notes																																												$ 400,000,000.0	$ 250,000,000.0
Cantor [Member] | Class B Units [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Percentage of ownership interest																						20.00%
Equity investment																						$ 24,200,000
Post-closing adjustment																						$ 4,800,000
Cantor [Member] | Newmark [Member] | Class A Common Stock [Member]
Related Party Transactions [Abstract]
Common stock, shares issued | shares												449,917
CF & Co [Member]
Related Party Transactions [Abstract]
Payment percentage of the gross proceeds from the sale of shares																				5.50%
Repurchase agreements																											0				0				$ 0	$ 0
Issuance of Class A common stock (net of costs), shares | shares																																			200,000	900,000
Aggregate proceeds from issuance of common stock																																			$ 900,000	$ 5,300,000
Weighted-average price per share | $ / shares																																			$ 4.11	$ 6.17
Related party expenses																																			$ 9,000	$ 100,000	9,000,000.0
Securities loaned																											0				$ 13,900,000				0	$ 13,900,000
Stated interest rate																															2.45%					2.45%
Guarantee fees																																			100,000	$ 100,000	100,000
CF & Co [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses																																			14,000
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
Debt repurchase amount																											15,000,000.0								15,000,000.0
CF & Co [Member] | 5.375% Senior Notes Due 2023 [Member]
Related Party Transactions [Abstract]
Advisory fees															200,000
CF & Co [Member] | 5.375% Senior Notes Due 2023 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses															300,000
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] | 4.375% Senior Notes [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses				$ 200,000																															36,000
Purchased senior notes																											14,500,000								14,500,000
Debt repurchase amount																											14,500,000								$ 14,500,000
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member]
Related Party Transactions [Abstract]
Securities loaned																															$ 13,900,000					$ 13,900,000
CF Group Management, Inc. [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares													700,000												34,600,000											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													10,300,000
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																									34,600,000											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																																			23,600,000
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																																			23,600,000
Cantor and Freedom [Member]
Related Party Transactions [Abstract]
Receivables from Freedom																											1,400,000				1,300,000				$ 1,400,000	$ 1,300,000
Receivables from Cantor related to open derivative contracts																											600,000				1,300,000				600,000	1,300,000
Payables to Cantor related to open derivative contracts																											100,000				2,000,000.0				100,000	2,000,000.0
Payables to Cantor related to pending equity trades																											26,000,000.0				2,300,000				26,000,000.0	2,300,000
Employee Loans [Member]
Related Party Transactions [Abstract]
Employee loans																											408,100,000				315,600,000				408,100,000	315,600,000
Compensation expense related to employee loans																																			67,000,000.0	35,700,000	16,500,000
Interest income																																			8,800,000	4,800,000	$ 3,600,000
Castle Oak | 5.125% Senior Notes Due 2021 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses																								$ 18,000
Castle Oak | 5.375% Senior Notes Due 2023 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses															$ 41,000
Castle Oak | 3.750% Senior Notes Due October 1, 2024 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses							$ 36,000
Cantor Fitzgerald Relief Fund [Member]
Related Party Transactions [Abstract]
Charitable contributions																											1,100,000								1,100,000
Cantor Fitzgerald Relief Fund [Member] | Accounts Payable and Accrued Liabilities
Related Party Transactions [Abstract]
Charitable contributions																											$ 1,600,000				$ 4,000,000.0				1,600,000	$ 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									$ 800,000

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Amount Of Asset Backed Commercial Paper Facility

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Amount which the Company is authorized to invest in an asset-backed commercial paper program with a related party.

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Area of sublease.

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Maximum amount of loans, investments or other credit support arrangements that the company is authorized to invest.

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Increase or decrease in the maximum amount of loans, investments or other credit support arrangements that the company is authorized to invest.

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Charitable Contributions

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Class Of Common Stock Exchanged To Another Class Of Common Stock

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Class of common stock held by parent.

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Common shares distributed to stockholders per share.

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Common stock, value of capital shares reserved for future issuance.

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Common Stock Weighted Average Price Per Share

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Determination price.

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The compensation expense recognized during the period related to employee loans.

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Exchange share price.

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- Definition

Guarantee fee expenses.

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Lessee operating lease sublease term.

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Lessee operating sublease description.

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- Definition

Limited partnership units exchange ratio.

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Loan receivable description of variable rate basis.

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Loan receivable maturity date.

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Loans forgivable loans and other receivables from employees and partners.

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- Definition

Percentage mark-up charged to related party for cost of administrative services, technology services or other support.

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- Definition

Non-exchangeable units redemption, value.

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Number of exchange rights grant.

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Number of exchangeable Plpus.

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- Definition

Number of interest units owned in limited partnership.

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Number of LPU issued on exchangeable.

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Number of net share issued for non exchangeable units redemption.

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Number of non-exchangeable LPU.

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Number of non exchangeable LPU redemption.

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Number of non-exchangeable PPSU approved cancellation.

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Number of non exchangeable ppsu approved redemption.

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Number of non-exchangeable PSU approved cancellation.

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Number of non-exchangeable psu approved redemption.

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Number of non-exchangeable units redeemed.

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Number of PLPU share issued for non exchangeable.

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Number of remaining exchangeable Lpus.

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Number of share issued for non exchangeable units.

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Number Of Units Acquired

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Number of units purchase by related party in operating partnership as limited partner.

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- Definition

Payables related to pending trades.

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- Definition

Payment related tax for redeemed PLPU.

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Payment related tax rate for common stock.

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- Definition

Payment related to exchangeable lpus and Plpus redeemed upon exchange in connection with llp status.

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- Definition

Payment related to withholding tax rate for common shares issued.

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- Definition

Commission paid to related party broker for sale of shares.

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- Definition

Percentage of distributions.

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Percentage of shares repurchased on exchangeable LPU.

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Percentage of withholding tax rate for common shares issued.

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Total expense related to fees paid to a related party to cover the compensation costs of leased employees, which is included as "compensation and employee benefits" in the consolidated statements of operations.

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- Definition

Remaining liability related to charitable contributions.

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Right to Purchase founding partner unit outstanding.

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Shares repurchased at average price of shares.

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Stock issued during period additional consideration.

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Stockholders distribution current exchange ratio.

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Subsidiary ownership percentage.

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Transaction charge of grant of exchangeability.

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Amount for accounts payable to related parties.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Amount of interest expense incurred on a debt or other obligation to related party.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

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Description of long-term debt arrangements, which are debt arrangements that originally require full repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer, and disclosures pertaining to the underlying arrangements, including repayment terms, conversion features, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. Types of long-term debt arrangements include borrowing under notes payable, bonds payable, debentures, term loans, and other contractual obligations for payment.

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Cash payments to lessor's for use of assets under operating leases.

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