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Related Party Transactions - Additional Information (Detail)																		1 Months Ended	3 Months Ended	12 Months Ended
	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 ($)	Mar. 19, 2018 USD ($)	Mar. 07, 2018 USD ($) $ / shares shares	Feb. 26, 2018 $ / shares shares	Dec. 13, 2017	Nov. 04, 2016 USD ($)	Oct. 25, 2016 shares	May 27, 2016 USD ($)	Jun. 05, 2015 shares	Nov. 30, 2014	Mar. 31, 2019 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2015 USD ($)	Aug. 08, 2019 USD ($)	Feb. 27, 2019 USD ($)	Aug. 06, 2018 USD ($)	Feb. 16, 2018 USD ($)	Sep. 08, 2017 USD ($)	Apr. 21, 2017 USD ($)	Aug. 31, 2013 USD ($)
Related Party Transactions [Abstract]
Cantor's share of net profit in Tower Bridge																				$ 29,236,000	$ 29,993,000	$ 36,167,000
Payment percentage of the gross proceeds from the sale of shares																		2.00%
Number of shares, right to exchange from Class A to Class B common stock | shares																					11,036,273
Equity method investments																				40,000,000	$ 35,211,000
Equity investment																				1,715,000	925,000	106,824,000
Repurchase agreements																					986,000
Commissions																				1,645,818,000	1,511,522,000	1,334,383,000
Common stock, issued during the period, additional consideration							$ 0
Principal sum of loan due from related parties																				14,273,000	7,748,000
Line of credit facility, outstanding amount																				0
Interest expense																				59,077,000	41,733,000	76,958,000
Payables to Cantor related to open derivative contracts																				72,497,000	40,155,000
Employee loans																				315,590,000	216,868,000
Interest income																				18,319,000	14,404,000	14,557,000
Aggregate proceeds from issuance of common stock																					327,624,000	$ 26,606,000
Securities loaned																				$ 13,902,000	$ 15,140,000
Limited Partnership Units Exchange Ratio																				1
Repurchase of Class A common stock, shares | shares																			233,000	233,000
Mr. Lutnick [Member] | Preferred Units [Member]
Related Party Transactions [Abstract]
Determination price | $ / shares																					$ 6.57
Number of non-exchangeable units redeemed | shares					376,651																760,797
Non-exchangeable units redemption, value																					$ 5,000,000
Number of non-exchangeable PSU approved redemption | shares					376,651
Exchange share price | $ / shares					$ 6.21
Number of LPU issued on exchangeable					$ 2,339,000
Number of PLPU share issued for non exchangeable | shares					463,969
Payment of witholding tax rate for common stock issue					$ 2,661,000
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. Windeatt [Member] | U.K. [Member]
Related Party Transactions [Abstract]
Determination price | $ / shares				$ 5.6457																	$ 4.388
Exchange share price | $ / shares				$ 6.26																	$ 5.17
Number of LPU issued on exchangeable				$ 137,845																	$ 720,000
Number of PLPU share issued for non exchangeable | shares				9,495																	63,814
Payment of witholding tax rate for common stock issue				$ 53,606																	$ 280,002
Number of non-exchangeable LPU redemption | shares				22,020																	139,265
Mr. Lynn [Member] | U.K. [Member]
Related Party Transactions [Abstract]
Determination price | $ / shares				$ 4.1239																	$ 3.894
Number of non-exchangeable PSU approved redemption | shares				43,131																	750,308
Exchange share price | $ / shares				$ 6.26																	$ 5.17
Number of LPU issued on exchangeable				$ 270,000																	$ 3,879,092
Number of PLPU share issued for non exchangeable | shares				25,461																	287,888
Payment of witholding tax rate for common stock issue				$ 105,000																	$ 1,120,909
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%
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%											5.375%	5.375%
Debt maturity year									2023
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%
Real Estate L.P.
Related Party Transactions [Abstract]
Equity method investments																												$ 100,000,000.0
Aqua [Member]
Related Party Transactions [Abstract]
Equity investment																				$ 1,700,000	$ 1,000,000.0
Principal sum of loan due from related parties																				$ 980,000
Increase in authorization amount for loans and investments, other credit support arrangements																								$ 1,000,000.0
Authorization amount for loans and investments, other credit support arrangements																								$ 17,200,000
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%
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
Class A Common Stock [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock | shares																					11,036,000
Common stock, shares issued | shares																				358,440,000	341,745,000
Issuance of Class A common stock (net of costs), shares | shares																				212,711	26,003,424	1,994,670
Repurchase of Class A common stock, shares | shares																				233,172	788,788	1,386,769
Average price per share of common stock repurchased | $ / shares																				$ 5.30	$ 13.23
Class A Common Stock [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] | Stephen M. 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] | 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
Issuance of Class A common stock (net of costs), shares | shares																				0
Limited Partnership Units Exchange Ratio							1
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] | Revolving Credit Facility [Member]
Related Party Transactions [Abstract]
Loans to inter company										$ 150,000,000.0
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						0.9400
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 in Tower Bridge																				$ 3,100,000	$ 1,100,000	$ 500,000
Recognized related party revenues																				29,400,000	24,100,000	27,100,000
Service charges																				59,100,000	52,400,000	43,600,000
Compensation to leased employees																				39,800,000	32,200,000	27,800,000
Repurchase agreements																					1,000,000.0
Recognition of share of FX gains (losses)																				300,000	(1,600,000)	(2,500,000)
Commissions																				200,000	300,000	300,000
Investment in asset-backed commercial paper program																				0	0
Investment authorization in asset-backed commercial paper program																														$ 350,000,000.0
Principal sum of loan due from related parties																													$ 150,000,000.0
Line of credit facility, outstanding amount																					0							$ 150,000,000.0
Interest income from affiliate																				0	0	2,600,000
Reverse purchase agreement outstanding																				$ 0	0
Securities loaned																					15,100,000
Founding partner units remaining | shares																				1,749,347
Cantor [Member] | Revolving Credit Facility [Member]
Related Party Transactions [Abstract]
Principal amount of debt component										250,000,000.0																$ 400,000,000.0
Credit agreement, description																				The BGC Credit Agreement will mature on the earlier to occur of (a) March 19, 2020, 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										150,000,000.0										$ 0	0
Interest expense																				0	3,900,000
Interest expense related discontinued operation																				0	3,500,000
Borrowings under credit facility										$ 150,000,000.0
Cantor [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Recognized related party revenues																				$ 400,000	800,000	1,200,000
Cantor [Member] | Class B Units [Member] | Lucera [Member]
Related Party Transactions [Abstract]
Equity investment														$ 24,200,000
Post-closing adjustment														$ 4,800,000
Percentage of ownership interest														20.00%
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																					$ 1,000,000.0
Issuance of Class A common stock (net of costs), shares | shares																				900,000	33,800,000
Aggregate proceeds from issuance of common stock																				$ 5,300,000	$ 447,800,000
Weighted-average price per share | $ / shares																				$ 6.17	$ 13.26
Related party expenses																				$ 100,000	$ 9,000,000.0	1,400,000
Securities loaned																				$ 13,900,000	$ 15,100,000
Stated interest rate																				2.45%	2.94%
Guarantee fees																				$ 100,000	$ 100,000	100,000
CF & Co [Member] | 5.125% Senior Notes Due 2021 [Member]
Related Party Transactions [Abstract]
Advisory fees																15,000,000.0
CF & Co [Member] | 5.125% Senior Notes Due 2021 [Member] | Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses																500,000
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] | Securities Financing Transaction, Fair Value [Member]
Related Party Transactions [Abstract]
Securities loaned																				$ 13,900,000	15,300,000
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 Freedom International Brokerage [Member]
Related Party Transactions [Abstract]
Receivables from Freedom International Brokerage																				$ 1,300,000	1,400,000
Receivables from Cantor related to open derivative contracts																				1,300,000	1,600,000
Payables to Cantor related to open derivative contracts																				2,000,000.0	2,100,000
Payables to Cantor related to pending equity trades																				2,300,000	0
Receivables from Cantor related to pending equity trades																					0
Employee Loans [Member]
Related Party Transactions [Abstract]
Employee loans																				315,600,000	216,900,000
Compensation expense related to employee loans																				35,700,000	13,000,000.0	26,900,000
Interest income																				4,800,000	3,600,000	$ 2,800,000
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] | Accounts Payable and Accrued Liabilities
Related Party Transactions [Abstract]
Charitable contributions																				$ 4,000,000.0	$ 20,000,000.0
Cantor Fitzgerald Relief Fund [Member] | Other Expenses [Member]
Related Party Transactions [Abstract]
Charitable contributions																							$ 40,000,000.0

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No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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No definition available.

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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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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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This represents the company's cost incurred during an accounting period for managing the money in a fund, which will be billed back to the client and is a component of noninterest expenses.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow from the additional capital contribution to the entity.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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No definition available.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Information about borrowings which initially required repayment in less than twelve months (or normal operating cycle, if longer) after its issuance and that does not otherwise qualify as long-term debt. It typically is comprised of borrowings under letters of credit, lines of credit, commercial paper, and notes payable of short duration. Disclosures include amounts of borrowings under each arrangement, description of underlying arrangements, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements such as the effects of refinancings and noncompliance with debt covenants.

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Number of new stock issued during the period.

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No definition available.

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No definition available.

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Number of shares that have been repurchased during the period and are being held in treasury.

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