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Related Party Transactions - Additional Information (Detail)																				1 Months Ended			3 Months Ended		12 Months Ended
	Dec. 21, 2021 USD ($) shares	Oct. 28, 2021 USD ($) shares	Jul. 30, 2021 USD ($)	Jun. 28, 2021 USD ($) $ / shares shares	Jun. 24, 2021	Apr. 29, 2021 USD ($) shares	Apr. 23, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Feb. 22, 2021 USD ($) shares	Aug. 14, 2020 USD ($)	Jul. 10, 2020 USD ($)	Mar. 20, 2020	Sep. 27, 2019 USD ($)	Nov. 23, 2018 USD ($) shares	Aug. 06, 2018 USD ($)	Jul. 24, 2018 USD ($)	Oct. 25, 2016 shares	May 27, 2016 USD ($)	Jun. 05, 2015 shares	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	May 31, 2020 USD ($) ft²	Mar. 31, 2022 USD ($) shares	Mar. 31, 2021 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2021 USD ($)	May 31, 2021 USD ($)	Apr. 08, 2021 shares	Feb. 25, 2021 USD ($)	Aug. 05, 2020 USD ($)	Jun. 11, 2020 USD ($)	Mar. 02, 2020 $ / shares	Feb. 05, 2020 USD ($)	Mar. 19, 2018 USD ($)	Nov. 04, 2016	Aug. 31, 2013 USD ($)
Related Party Transactions [Abstract]
Repurchase agreements																							$ 7,511,000			$ 0
Commissions																							356,664,000	$ 435,220,000
Payables to Cantor related to open derivative contracts																							77,898,000			53,764,000
Employee loans																							296,185,000			286,967,000
Number of H units redeemed (in shares) | shares				1,131,774
Payment related to H units redeemed				$ 7,017,000
Number of preferred H units redeemed (in shares) | shares				1,018,390
Payment related tax for redeemed preferred H units				$ 7,983,000
Due to related parties																							0			8,300,000
Equity investment																							343,000	355,000
Receivables from related parties																							6,398,000			5,237,000
Futures Exchange Group
Related Party Transactions [Abstract]
Payments to acquire businesses			$ 4,900,000
Aqua
Related Party Transactions [Abstract]
Increase in authorization amount for loans and investments, other credit support arrangements																													$ 1,000,000				$ 2,000,000
Authorization amount for loans and investments, other credit support arrangements																													$ 20,200,000
Equity investment																							300,000	$ 400,000
Receivables from related parties																							$ 980,000
Loan receivable, basis spread																							6.00%
Stephen M. Merkel
Related Party Transactions [Abstract]
Number of non-exchangeable units redeemed (in shares) | shares						108,350
Number of non-exchangeable PSUs (in shares) | shares						273,612
Payment related to non-exchangeable PSUs redeemed upon exchange						$ 0
Number of non-exchangeable PPSUs redeemed | shares						101,358
Number of non-exchangeable PPSUs (in shares) | shares						250,659
Payments related to non-exchangeable PPSUs redeemed upon exchange						$ 575,687
Number of PSU approved redemption (in shares) | shares	90,366
Payment related to PSU redeemed	$ 0
Number of PPSU approved redemption (in shares) | shares	149,301
Payment related to non exchangeable PPSU redeemed	$ 555,990
Mr. Lutnick
Related Party Transactions [Abstract]
Number of non-exchangeable PSUs (in shares) | shares	2,011,731
Payment related to non-exchangeable PSUs redeemed upon exchange	$ 0
Payments related to non-exchangeable PPSUs redeemed upon exchange	$ 1,525,706
Number of H units redeemed (in shares) | shares	376,651
Payment related to H units redeemed	$ 2,339,003
Number of preferred H units redeemed (in shares) | shares	463,969
Number of non exchangeable P P S U approved redemption (in shares) | shares	1,939,896
Payment related to non exchangeable PPSU approved redemption	$ 10,851,803
Number of exchangeable PPSU (in shares) | shares	425,766
Number of HDUs redeemed (in shares) | shares	376,651
Payment related for redeemed preferred H units (in shares)	$ 2,661,000
Mr. Lutnick | Exchange LPUs For Common Stock
Related Party Transactions [Abstract]
Number of non-exchangeable LPU (in shares) | shares				88,636
Number of exchangeable LPU exchanged for issuance of shares (in shares) | shares				520,380
Exchange share price (in dollars per share) | $ / shares				$ 5.86
Number of shares redeemed (in shares) | shares				0
Mr. Lutnick | Exchange PLPUs for Common Stock
Related Party Transactions [Abstract]
Number of exchangeable PLPUs (in shares) | shares				425,765
Payment related tax for redeemed PLPU				$ 1,525,705
Sean A. Windeatt
Related Party Transactions [Abstract]
Number of exchange rights grant (in shares) | shares									123,713
Number of non-exchangeable LPU (in shares) | shares									123,713
Number of PLPU share issued for non-exchangeable (in shares) | shares									28,477
Payment of withholding tax rate for common stock issue									$ 178,266
Shares authorized to be repurchased (in shares) | shares							123,713
Exchange share price (in dollars per share) | $ / shares							$ 5.65																									$ 5.38
Number of shares redeemed (in shares) | shares							28,477
Number of shares redeemed, value							$ 178,266
Remaining number of shares authorized to be repurchased (in shares) | shares																												62,211
Debt Securities
Related Party Transactions [Abstract]
Debt instrument, authorized repurchase amount																															$ 50,000,000
Debt instrument, remaining authorized repurchase amount																							$ 50,000,000
5.125% Senior Notes Due 2021
Related Party Transactions [Abstract]
Principal amount of debt component																		$ 300,000,000
Stated interest rate																		5.125%
5.375% Senior Notes Due 2023
Related Party Transactions [Abstract]
Principal amount of debt component																$ 450,000,000
Stated interest rate																5.375%
3.750% Senior Notes Due October 1, 2024
Related Party Transactions [Abstract]
Principal amount of debt component													$ 300,000,000
Stated interest rate													3.75%
4.375% Senior Notes
Related Party Transactions [Abstract]
Principal amount of debt component											$ 300,000,000
Stated interest rate								4.375%			4.375%												4.375%	4.375%
5.125% Senior Notes
Related Party Transactions [Abstract]
Principal amount of debt component																		$ 300,000,000												$ 300,000,000
Stated interest rate																		5.125%					5.125%
14.66% Senior Notes
Related Party Transactions [Abstract]
Principal amount of debt component										$ 44,000,000
Stated interest rate										14.66%
Class B Common Stock
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs) (in shares) | shares																							0	0
Class A Common Stock
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs) (in shares) | shares																							4,956	262,373
Stock repurchased during period (in shares) | shares																							0	1,000,000
Class A Common Stock | Stephen M. Merkel
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs) (in shares) | shares	90,366					108,350
Stock repurchased during period (in shares) | shares						108,350
Class A Common Stock | Mr. Lutnick
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs) (in shares) | shares	2,011,731
Class A Common Stock | Mr. Lutnick | Exchange LPUs For Common Stock
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs) (in shares) | shares				520,380
Common stock, shares issued net of shares for tax withholdings (in shares) | shares				365,229
Class A Common Stock | Mr. Lutnick | Exchange PLPUs for Common Stock
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs) (in shares) | shares				88,636
Common stock, shares issued net of shares for tax withholdings (in shares) | shares				41,464
Class A Common Stock | Sean A. Windeatt
Related Party Transactions [Abstract]
Number of exchangeable LPU exchanged for issuance of shares (in shares) | shares									123,713
Class B Units | Lucera
Related Party Transactions [Abstract]
Purchase of units (in shares) | shares																	9,000
Percentage of outstanding common stock owned by parent																																			100.00%
Cantor
Related Party Transactions [Abstract]
Repurchase agreements																							$ 7,500,000			0
Futures Exchange Group | Cantor
Related Party Transactions [Abstract]
Related party transaction, contributed capital																							$ 0	$ 900,000
Tower Bridge International Services LP | BGC Partners, Inc.
Related Party Transactions [Abstract]
Company ownership of Tower Bridge																							52.00%
Tower Bridge International Services LP | Cantor
Related Party Transactions [Abstract]
Ownership percentage by noncontrolling owners																							48.00%
Aqua | BGC Partners, Inc.
Related Party Transactions [Abstract]
Percentage of ownership interest																							49.00%
Aqua | Cantor
Related Party Transactions [Abstract]
Investment ownership percentage																							51.00%
Cantor
Related Party Transactions [Abstract]
Mark-up cost of services																							7.50%
Cantor's share of net profit (loss) in Tower Bridge																							$ 300,000	40,000
Recognized related party revenues																							3,300,000	3,800,000
Service charges																							21,200,000	21,100,000
Compensation to leased employees																							15,500,000	15,800,000
Recognition of share of FX gains																							300,000	100,000
Commissions																							70,000	25,000
Investment authorization in asset-backed commercial paper program																																				$ 350,000,000
Investment in asset-backed commercial paper program																							0			0
Common stock, issued during the period, additional consideration														$ 0
Reverse purchase agreement outstanding																							0			0
Cantor | Futures Exchange Group
Related Party Transactions [Abstract]
Business combination, indemnified expenses (up to)			$ 1,000,000
Indemnification assets																										400,000
Cantor | Lucera
Related Party Transactions [Abstract]
Recognized related party revenues																							12,600	100,000
Cantor | Revolving Credit Facility
Related Party Transactions [Abstract]
Principal amount of debt component															$ 400,000,000																			$ 250,000,000
Debt instrument, extended term															1 year
Debt instrument, non-extension notice term															6 months
Debt instrument, basis spread on variable rate												1.00%
Line of credit facility, outstanding amount																							0			0
Interest expense from affiliate																							$ 0	$ 0
CF Group Management, Inc.
Related Party Transactions [Abstract]
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares														700,000					34,600,000
Common stock, issued during the period, additional consideration														$ 0
Cantor Rights to Purchase Exchangeable Units
Related Party Transactions [Abstract]
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares														10,300,000									23,600,000
Limited partnership units, exchange ratio																							1
Cantor Rights to Purchase Exchangeable Units | Maximum
Related Party Transactions [Abstract]
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares																			34,600,000				23,600,000
Cantor Rights to Purchase Exchangeable Units | BGC Holdings LPUs
Related Party Transactions [Abstract]
Limited partnership units, exchange ratio		1						1
Aggregate cantor units as result of redemption | shares		460,929						1,149,684																1,149,684
Aggregate consideration of cantor units as result of redemption		$ 715,605						$ 2,104,433
Number of founding partner interests as result of redemption (in shares) | shares		460,929						1,149,684
Aggregate cantor units (in shares) | shares		1,179,942						1,618,376																1,618,376
Aggregate consideration of cantor units		$ 2,033,838						$ 3,040,411
Number of founding partner interests exchanged (in shares) | shares		1,179,942						1,618,376
Founding partner units remaining (in shares) | shares																							200,000
Cantor and CFGM | Class B Common Stock
Related Party Transactions [Abstract]
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares																							23,600,000
Cantor and Freedom
Related Party Transactions [Abstract]
Receivables from Freedom																							$ 2,100,000			1,400,000
Receivables from Cantor related to open derivative contracts																							4,300,000			2,500,000
Payables to Cantor related to open derivative contracts																							5,900,000			1,500,000
Payables to Cantor related to pending equity trades																							27,200,000			0
Employee Loans
Related Party Transactions [Abstract]
Employee loans																							296,200,000			287,000,000
Compensation expense related to employee loans																							9,900,000	$ 15,600,000
Interest income																							1,200,000	$ 2,200,000
CF & Co
Related Party Transactions [Abstract]
Repurchase agreements																							$ 7,500,000			0
Issuance of Class A common stock (net of costs) (in shares) | shares																							0	0
Related party expenses																							$ 0
Securities loaned																							0			0
Guarantee fees																							31,000	$ 31,000
CF & Co | Underwriting Fees
Related Party Transactions [Abstract]
Related party expenses										$ 14,000
CF & Co | 5.125% Senior Notes Due 2021 | Underwriting Fees
Related Party Transactions [Abstract]
Related party expenses																		$ 500,000
Purchased senior notes										$ 15,000,000
CF & Co | 5.375% Senior Notes Due 2023
Related Party Transactions [Abstract]
Advisory fees																$ 200,000
CF & Co | 5.375% Senior Notes Due 2023 | Underwriting Fees
Related Party Transactions [Abstract]
Related party expenses																$ 300,000
CF & Co | 4.375% Senior Notes
Related Party Transactions [Abstract]
Purchased senior notes																							14,500,000
CF & Co | 4.375% Senior Notes | Underwriting Fees
Related Party Transactions [Abstract]
Related party expenses											$ 200,000
Castle Oak | 3.750% Senior Notes Due October 1, 2024 | Underwriting Fees
Related Party Transactions [Abstract]
Related party expenses													$ 200,000
Cantor Fitzgerald Relief Fund
Related Party Transactions [Abstract]
Additional expense associated with charitable contributions																										8,300,000
Charitable contributions, additional expense recognized																				$ 7,200,000	$ 1,100,000
Cantor Fitzgerald Relief Fund | Accounts Payable and Accrued Liabilities
Related Party Transactions [Abstract]
Remaining liability associated with charitable contributions																							$ 1,600,000			$ 1,700,000
Cantor Fitzgerald Relief Fund | Other Expenses
Related Party Transactions [Abstract]
Charitable contributions																									$ 40,000,000
RKF Retail Holdings LLC
Related Party Transactions [Abstract]
Lessee operating lease sublease term																						1 year
Area of sublease | ft²																						21,000
BGC U.S OpCo
Related Party Transactions [Abstract]
Operating lease cost																						$ 1,100,000
Rent payment under lease term																								$ 300,000
Aurel BGC SAS | Cantor
Related Party Transactions [Abstract]
Percentage of revenue shared between related parties					80.00%
Revenue sharing agreement, term					12 months
Poten & Partners
Related Party Transactions [Abstract]
Monthly rent expense																											$ 15,000

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