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Related Party Transactions - Additional Information (Detail)													3 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	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2019 USD ($) shares	Aug. 08, 2019 USD ($)	Feb. 27, 2019 USD ($)	Aug. 06, 2018 USD ($)	Mar. 19, 2018 USD ($)	Nov. 04, 2016	Aug. 31, 2013 USD ($)
Related Party Transactions [Abstract]
Repurchase agreements													$ 512,000
Commissions													455,855,000	$ 430,182,000
Common stock, issued during the period, additional consideration							$ 0
Interest expense from affiliate													0	0
Payables to Cantor related to open derivative contracts													8,511,000			$ 72,497,000
Employee loans													339,259,000			315,590,000
Interest income													4,161,000	$ 3,665,000
Securities loaned													$ 2,973,000			13,902,000
Limited Partnership Units Exchange Ratio													1
Repurchase of Class A common stock, shares | shares														233,172
Equity investment													$ 245,000	$ 368,000
Principal sum of loan due from related parties													6,589,000			$ 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													200,000	$ 400,000
Principal sum of loan due from related parties													$ 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%
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
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
Stated interest rate			3.75%
Maximum [Member]
Related Party Transactions [Abstract]
Payment percentage of the gross proceeds from the sale of shares								2.00%
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													361,583,000			358,440,000
Issuance of Class A common stock (net of costs), shares | shares													71,663	61,642
Repurchase of Class A common stock, shares | shares													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
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
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						0.9461
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%
Aqua [Member] | BGC Partners, Inc. [Member]
Related Party Transactions [Abstract]
Percentage of ownership interest													49.00%
Aqua [Member] | Cantor [Member]
Related Party Transactions [Abstract]
Investment ownership percentage													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													$ (100,000)	$ (300,000)
Recognized related party revenues													5,500,000	5,800,000
Service charges													15,900,000	12,800,000
Compensation to leased employees													10,400,000	9,900,000
Repurchase agreements													500,000			$ 0
Recognition of share of FX gains (losses)													(1,700,000)	(200,000)
Commissions													75,000	78,000
Investment in asset-backed commercial paper program													0			0
Investment authorization in asset-backed commercial paper program																						$ 350,000,000.0
Reverse purchase agreement outstanding													$ 0			0
Founding partner units remaining | shares													2,101,783
Cantor [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Recognized related party revenues													$ 100,000	100,000
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
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%
Repurchase agreements													$ 500,000	$ 0
Issuance of Class A common stock (net of costs), shares | shares													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													$ 3,000,000.0			$ 13,900,000
Stated interest rate													0.58%			2.45%
Guarantee fees													$ 31,000	31,000
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
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													$ 2,800,000			$ 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							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			1,300,000
Receivables from Cantor related to open derivative contracts													1,000,000.0			1,300,000
Payables to Cantor related to open derivative contracts													1,100,000			2,000,000.0
Payables to Cantor related to pending equity trades													7,900,000			2,300,000
Employee Loans [Member]
Related Party Transactions [Abstract]
Employee loans													339,300,000			315,600,000
Compensation expense related to employee loans													14,600,000	6,600,000
Interest income													1,200,000	$ 1,000,000.0
Castle Oak | 5.125% Senior Notes Due 2021 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses											$ 18,000
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] | Accounts Payable and Accrued Liabilities
Related Party Transactions [Abstract]
Charitable contributions													$ 4,400,000			$ 4,000,000.0
Cantor Fitzgerald Relief Fund [Member] | Other Expenses [Member]
Related Party Transactions [Abstract]
Charitable contributions															$ 40,000,000.0

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