Aggregate exchangeable limited partnership units outstanding.

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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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No definition available.

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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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Business acquisition post closing adjustments.

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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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Common Stock Weighted Average Price Per Share

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Contractually specified servicing fees, ancillary fees, escrow interest and placement fees earned in exchange for servicing financial assets.

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Year when the debt instrument is scheduled to be fully repaid.

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Development expenses.

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

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Guarantee fee expenses.

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

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Non exchangeable founding or working partner units redeemed.

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Non exchangeable founding or working partner units redeemed amount.

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Non-exchangeable partnership units redeemed and cancelled.

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Number of interest units owned in limited partnership.

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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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Payables related to pending trades.

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Commission paid to related party broker for sale of shares.

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Purchase of units upon redemption of founding working partner units and subsequent repurchases units.

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Receivables related to pending trades.

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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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Related party transactions broker fees and commissions.

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Remaining liability related to charitable contributions.

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Right to Purchase founding partner unit outstanding.

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Subsidiary ownership percentage.

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Amount for accounts payable to related parties.

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Amount of receivables arising from transactions with related parties, due after 1 year (or 1 business cycle).

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Amount of commission revenue from buying and selling securities on behalf of customers.

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Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Expense related to distribution, servicing and underwriting fees.

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Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans.

+ References

No definition available.

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

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Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest.

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Amount of the cost of borrowed funds accounted for as interest expense.

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

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No definition available.

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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.

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Amount of interest income earned from interest-bearing assets owed to the entity by related party.

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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.

+ References

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the 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.

+ References

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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-Subparagraph (SX 210.5-02.22)
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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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Namespace Prefix:	us-gaap_
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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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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 outflow to obtain servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting.

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Balance Type:	credit
Period Type:	duration

- Definition

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

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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Balance Type:	debit
Period Type:	duration

- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of transactions with related party during the financial reporting period.

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Period Type:	duration

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

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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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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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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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No definition available.

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No definition available.

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

+ References

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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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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

+ References

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Namespace Prefix:	us-gaap_
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- Definition

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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Namespace Prefix:	us-gaap_
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- Definition

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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Related Party Transactions - Additional Information (Detail)																				1 Months Ended			3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 24, 2018 USD ($)	Mar. 19, 2018 USD ($)	Mar. 11, 2018 USD ($) $ / shares shares	Mar. 09, 2018	Mar. 07, 2018 USD ($) $ / shares shares	Dec. 15, 2017 shares	Nov. 29, 2017 $ / shares shares	Nov. 07, 2017 USD ($) shares	Oct. 04, 2017 $ / shares shares	Sep. 08, 2017 USD ($)	Apr. 12, 2017	Jan. 31, 2017 $ / shares shares	Nov. 04, 2016 USD ($)	Oct. 25, 2016 shares	May 27, 2016 USD ($)	Feb. 09, 2016 USD ($)	Jun. 05, 2015 shares	Mar. 11, 2015	Oct. 29, 2013	Sep. 30, 2018 USD ($) $ / shares shares	Aug. 31, 2018 $ / shares	Jul. 31, 2018 $ / shares	Sep. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2018 $ / shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2015 USD ($)	Aug. 06, 2018 USD ($)	Mar. 18, 2018 USD ($)	Dec. 26, 2017	Dec. 13, 2017 USD ($)	Apr. 21, 2017 USD ($)	Jan. 15, 2016	Oct. 27, 2015 USD ($)	Aug. 31, 2013 USD ($)
Related Party Transactions [Abstract]
Payment percentage of the gross proceeds from the sale of shares				2.00%							2.00%
Equity method investments																				$ 136,100,000			$ 136,100,000			$ 136,100,000		$ 135,600,000
Principal sum of loan due from related parties																				6,864,000			6,864,000			6,864,000		3,739,000
Equity investment																										23,099,000	$ 101,623,000
Repurchase agreements																				198,000			198,000			198,000
Commissions																							671,318,000		$ 582,106,000	1,998,237,000	1,704,998,000
Interest expense																							33,472,000		24,425,000	88,051,000	69,678,000
Payables to Cantor related to open derivative contracts																				67,816,000			67,816,000			67,816,000		40,988,000
Employee loans																				466,919,000			466,919,000			466,919,000		335,734,000
Interest income																							15,946,000		11,726,000	37,060,000	40,909,000
Aggregate proceeds from issuance of common stock																										327,624,000
Securities loaned																				$ 66,318,000			66,318,000			66,318,000		202,343,000
Related party service fee																			10.00%
Professional and consulting fees																							33,491,000		24,486,000	86,490,000	69,047,000
Payments of referrals for leasing or other services																							9,743,000		4,380,000	27,394,000	16,389,000
Total consideration transferred																										61,200,000		$ 1,000,000,000
Purchase of loans originated																										2,124,000
Loan origination related fees and sales premiums, net																							23,288,000		19,772,000	58,287,000	66,673,000
Servicing revenue from loans purchased																							34,948,000		29,057,000	96,207,000	80,729,000
Limited Partnership Units Exchange Ratio																												1
Issuance of Class A common stock (net of costs)																										$ 312,552,000		$ 57,721,000
Average price per share of common stock repurchased \| $ / shares																				$ 11.76	$ 11.85	$ 10.58		$ 13.37		$ 13.35
Gains from Mortgage Banking Activities, Net [Member]
Related Party Transactions [Abstract]
Broker fees and commissions																							$ 33,000		300,000	$ 800,000	700,000
5.125% Senior Notes Due 2021 [Member]
Related Party Transactions [Abstract]
Principal amount of debt component															$ 300,000,000
Stated interest rate															5.125%					5.125%			5.125%			5.125%		5.125%
Debt maturity year																										2021
5.375% Senior Notes Due 2023 [Member]
Related Party Transactions [Abstract]
Principal amount of debt component	$ 450,000,000
Stated interest rate	5.375%																			5.375%			5.375%			5.375%
Debt maturity year	2023																									2023
Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Aggregate non-exchangeable limited partnership units redeemed and cancelled \| shares			2,348,479
Mr. Lynn [Member]
Related Party Transactions [Abstract]
Shares held by executive officers \| shares												167,654
Average price per share of common stock repurchased \| $ / shares												$ 11.07
CF Real Estate Finance Holdings, L.P. [Member]
Related Party Transactions [Abstract]
Equity method investments										$ 100,000,000
Principal sum of loan due from related parties																				$ 195,000,000			$ 195,000,000			$ 195,000,000		$ 0
Aqua [Member]
Related Party Transactions [Abstract]
Principal sum of loan due from related parties																				$ 980,000			$ 980,000			$ 980,000
Percentage of ownership interest																				49.00%			49.00%			49.00%
Equity investment																							$ 200,000		$ 700,000	$ 600,000	$ 1,300,000
Increase in authorization amount for loans and investments, other credit support arrangements																																				$ 4,000,000
Authorization amount for loans and investments, other credit support arrangements																																				$ 16,200,000
Maturity date of subordinated loan																										Sep. 01, 2020
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%			6.00%
Partnership Units [Member] \| Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Aggregate non-exchangeable limited partnership units redeemed and cancelled \| shares			1,637,215
PPSUs [Member] \| Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Aggregate non-exchangeable limited partnership units redeemed and cancelled \| shares			711,264
Newmark [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units \| shares																				11,200,000			11,200,000			11,200,000
Newmark [Member] \| Limited Partnership Units [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units purchased \| shares					16,600,000
Aggregate consideration amount					$ 242,000,000
Number of interest units owned in limited partnership \| shares																				6,200,000			6,200,000			6,200,000
Newmark [Member] \| Partnership Units [Member] \| Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Aggregate non-exchangeable limited partnership units redeemed and cancelled \| shares			774,566
Newmark [Member] \| PPSUs [Member] \| Mr. Lutnick [Member]
Related Party Transactions [Abstract]
Aggregate non-exchangeable limited partnership units redeemed and cancelled \| shares			336,499
Newmark [Member] \| IPO [Member]
Related Party Transactions [Abstract]
Noncontrolling interest																																9.80%
BPF [Member]
Related Party Transactions [Abstract]
Total consideration transferred										875,000,000
Business acquisition price paid in units										$ 3,200,000
Business acquisition date										Sep. 08, 2017
Business acquisition, transaction agreement date										Jul. 17, 2017
Business acquisition post closing adjustments										$ 508,600,000
Class A Common Stock [Member]
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs), shares \| shares																										25,975,240		1,994,670
Cantor purchase of Cantor units from BGC Holdings upon redemption of founding/working partner units and subsequent repurchases by BGC Holdings, units \| shares																												1,179,788
Issuance of Class A common stock (net of costs)																										$ 260,000		$ 20,000
Number of shares issued as a result of stock option exercise \| shares																										979,344
Average price per share of common stock repurchased \| $ / shares																							$ 11.48		$ 13.41	$ 13.35	$ 11.68
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
Employee stock option exercised, shares \| shares							1,000,000
Employee stock option exercise price per share \| $ / shares							$ 16.24
Number of shares issued as a result of stock option exercise \| shares							147,448
Class A Common Stock [Member] \| Mr. Dalton [Member]
Related Party Transactions [Abstract]
Employee stock option exercised, shares \| shares									7,085
Employee stock option exercise price per share \| $ / shares									$ 15.30
Class A Common Stock [Member] \| Newmark [Member] \| Limited Partnership Units [Member]
Related Party Transactions [Abstract]
Share Price \| $ / shares					$ 14.57
Class A Common Stock [Member] \| Newmark [Member] \| IPO [Member]
Related Party Transactions [Abstract]
Noncontrolling interest																																16.60%
Issuance of Class A common stock (net of costs), shares \| shares						20,000,000
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%
Percentage of ownership interest																																			20.00%
Class B Common Stock [Member]
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs), shares \| shares																							0		0	0	0
Cantor and ELX [Member]
Related Party Transactions [Abstract]
Cantor's share of net income in Tower Bridge																							$ 1,400,000		$ 900,000	$ 400,000	$ 1,000,000
Service charges																							20,100,000		13,900,000	59,000,000	42,800,000
Compensation to leased employees																							10,300,000		9,500,000	31,600,000	26,400,000
Loan Referral Agreement [Member] \| Gains from Mortgage Banking Activities, Net [Member]
Related Party Transactions [Abstract]
Revenue from loan referral agreement																							$ 0		1,500,000	$ 2,200,000	2,200,000
Cantor [Member]
Related Party Transactions [Abstract]
Mark-up cost of services																										7.50%
Company ownership of Tower Bridge																										52.00%
Noncontrolling interest																				48.00%			48.00%			48.00%
Principal sum of loan due from related parties																																		$ 150,000,000
Repurchase agreements																				$ 200,000			$ 200,000			$ 200,000							$ 0
Recognition of share of foreign exchange losses																							(1,500,000)		46,000	(3,100,000)	(2,800,000)
Commissions																							59,000		82,000	194,000	224,000
Investment in asset-backed commercial paper program																				0			0			0		0
Investment authorization in asset-backed commercial paper program																																					$ 350,000,000
Maximum revolving credit																																		$ 150,000,000
Line of credit facility, outstanding amount										150,000,000										0			0			0
Interest income from affiliate																							0		1,300,000	0	1,300,000
Reverse purchase agreement outstanding																				$ 0			0			0							$ 0
Securities loaned																												202,300,000
Professional and consulting fees																							$ 0		0	$ 0	0
Founding partner units remaining \| shares																				1,178,869			1,178,869			1,178,869
Cantor [Member] \| Revolving Credit Facility [Member]
Related Party Transactions [Abstract]
Line of credit facility, outstanding amount																				$ 80,000,000			$ 80,000,000			$ 80,000,000
Principal amount of debt component		$ 250,000,000																												$ 400,000,000	$ 150,000,000
Credit agreement, description																										The BGC Credit Agreement will mature on the earlier to occur of (a) March 19, 2019, 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																				$ 80,000,000			$ 80,000,000			$ 80,000,000
Stated interest rate																				5.51%			5.51%			5.51%
Interest expense																							$ 1,400,000			$ 3,900,000
Interest rate		1.00%
Cantor [Member] \| Revolving Credit Facility [Member] \| One Month LIBOR [Member]
Related Party Transactions [Abstract]
Stated interest rate																				3.25%			3.25%			3.25%
Cantor [Member] \| Maximum [Member] \| Audit Committee [Member]
Related Party Transactions [Abstract]
Development expenses																$ 1,400,000
Cantor [Member] \| Lucera [Member]
Related Party Transactions [Abstract]
Recognized related party revenues																							$ 200,000		300,000	$ 600,000	1,000,000
Cantor [Member] \| Aqua [Member]
Related Party Transactions [Abstract]
Investment ownership percentage																				51.00%			51.00%			51.00%
Cantor [Member] \| Newmark [Member]
Related Party Transactions [Abstract]
Founding partner units remaining \| shares																				535,849			535,849			535,849
Cantor [Member] \| Class B Units [Member] \| Lucera [Member]
Related Party Transactions [Abstract]
Equity investment													$ 24,200,000
Post-closing adjustment													$ 4,800,000
Cantor and ELX [Member]
Related Party Transactions [Abstract]
Recognized related party revenues																							$ 7,100,000		7,200,000	$ 20,000,000	20,100,000
CF & Co [Member]
Related Party Transactions [Abstract]
Repurchase agreements																				$ 200,000			200,000			200,000		0
Securities loaned																				66,300,000			66,300,000			66,300,000		202,300,000
Guarantee fees																							31,300		$ 31,300	93,800	$ 93,800
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																				14,900,000			14,900,000			14,900,000
CF & Co [Member] \| 5.375% Senior Notes Due 2023 [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																				$ 66,300,000			$ 66,300,000			$ 66,300,000		$ 204,100,000
CF & Co [Member] \| Maximum [Member]
Related Party Transactions [Abstract]
Stated interest rate																				3.00%			3.00%			3.00%		4.30%
CF & Co [Member] \| Minimum [Member]
Related Party Transactions [Abstract]
Stated interest rate																				2.70%			2.70%			2.70%		1.90%
CF & Co [Member] \| Class A Common Stock [Member] \| Newmark [Member] \| IPO [Member]
Related Party Transactions [Abstract]
Payment percentage of the gross proceeds from the sale of shares																										5.50%
CF & Co [Member] \| April 2017 Sales Agreement [Member]
Related Party Transactions [Abstract]
Issuance of Class A common stock (net of costs), shares \| shares																							2,000,000		1,100,000	32,600,000	5,400,000
Aggregate proceeds from issuance of common stock																							$ 23,100,000		$ 15,100,000	$ 434,900,000	$ 62,900,000
Weighted-average price per share \| $ / shares																							$ 11.48		$ 13.24	$ 13.34	$ 11.62
Related party expenses																							$ 500,000		$ 300,000	$ 8,700,000	$ 1,300,000
CF & Co [Member] \| Monetization Transactions [Member]
Related Party Transactions [Abstract]
Related party expenses																										$ 4,000,000
CF Group Management, Inc. [Member]
Related Party Transactions [Abstract]
Number of shares, right to exchange from Class A to Class B common stock \| shares																	34,649,693
Cantor Rights to Purchase Exchangeable Units [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units purchased \| shares								823,178
Aggregate consideration amount								$ 2,800,000
Cantor purchase of Cantor units from BGC Holdings upon redemption of founding/working partner units and subsequent repurchases by BGC Holdings, units \| shares								1,179,788
Number of non-exchangeable founding/working partner units redeemed \| shares								823,178
Aggregate consideration of non-exchangeable founding/working partner units redeemed								$ 2,800,000
Cantor Rights to Purchase Exchangeable Units [Member] \| Exchange Rights [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units purchased \| shares								356,610
Aggregate consideration amount								$ 1,100,000
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																										34,649,693		34,649,693
Cantor Rights to Purchase Exchangeable Units [Member] \| IPO [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units \| shares								1,179,788
Cantor Rights to Purchase Exchangeable Units [Member] \| Newmark [Member] \| IPO [Member]
Related Party Transactions [Abstract]
Aggregate exchangeable limited partnership units \| shares								536,267
Cantor and CFGM [Member] \| Class A Common Stock [Member]
Related Party Transactions [Abstract]
Convertible Notes, shares \| shares																										11,039,011
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																										34,649,693
Cantor and Freedom International Brokerage [Member]
Related Party Transactions [Abstract]
Receivables from Freedom International Brokerage																				$ 1,400,000			1,400,000			$ 1,400,000		$ 1,300,000
Receivables from Cantor related to open derivative contracts																				3,000,000			3,000,000			3,000,000		800,000
Payables to Cantor related to open derivative contracts																				2,400,000			2,400,000			2,400,000		2,800,000
Payables to Cantor related to pending equity trades																				15,000,000			15,000,000			15,000,000
Receivables from Cantor related to pending equity trades																												500,000
Employee Loans [Member]
Related Party Transactions [Abstract]
Employee loans																				466,900,000			466,900,000			466,900,000		335,700,000
Compensation expense related to employee loans																							6,900,000		26,000,000	23,700,000	43,200,000
Interest income																							2,200,000		1,700,000	5,800,000	4,800,000
Castle Oak \| 5.125% Senior Notes Due 2021 [Member] \| Underwriting Fees [Member]
Related Party Transactions [Abstract]
Related party expenses															$ 18,000
CCRE [Member]
Related Party Transactions [Abstract]
Recognized related party revenues																							300,000		14,000	300,000	100,000
Payments of referrals for leasing or other services																							0		0	0	0
CCRE [Member] \| Note Receivable/Payable [Member]
Related Party Transactions [Abstract]
Interest income																									200,000		200,000
Interest expense																									300,000		2,400,000
CCRE [Member] \| One Month LIBOR [Member] \| Note Receivable/Payable [Member]
Related Party Transactions [Abstract]
Interest rate																		1.00%
CCRE [Member] \| Primary Servicing Rights [Member]
Related Party Transactions [Abstract]
Servicing rights of loans originated																				900,000,000			900,000,000		300,000,000	900,000,000	300,000,000
Purchase of loans originated																										1,500,000	600,000
Loan origination related fees and sales premiums, net																							0		0	0	0
Servicing revenue from loans purchased																							900,000		$ 900,000	2,800,000	$ 2,700,000
Cantor and CCRE and Cantor Commercial Real Estate Sponsor, L.P. [Member] \| BPF [Member]
Related Party Transactions [Abstract]
Transaction agreement, distribution										89,100,000
Business acquisition post closing adjustments										$ 508,600,000
Relief Fund [Member] \| Accounts Payable, Accrued and Other Liabilities [Member]
Related Party Transactions [Abstract]
Charitable contributions																				$ 30,700,000			$ 30,700,000			$ 30,700,000		$ 30,700,000
Relief Fund [Member] \| Other Expenses [Member]
Related Party Transactions [Abstract]
Charitable contributions																													$ 40,000,000