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v3.19.2

Related Party Transactions - Additional Information (Detail) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2019 USD ($) $ / shares shares | Nov. 30, 2018 USD ($) shares | May 01, 2018 USD ($) Employee | Mar. 19, 2018 | Mar. 07, 2018 USD ($) $ / shares shares | Dec. 13, 2017 | Sep. 08, 2017 USD ($) | Feb. 28, 2019 USD ($) | Oct. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Feb. 22, 2019 shares | Nov. 06, 2018 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees to related parties |  |  |  |  |  |  |  |  |  | $ 7,222,000 | $ 6,301,000 | $ 13,947,000 | $ 13,195,000 |  |  |  |
Loans, forgivable loans and other receivables from employees and partners |  |  |  |  |  |  |  |  |  | 320,400,000 |  | 320,400,000 |  | $ 285,532,000 |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  |  | 356,090,000 | 334,006,000 | 633,314,000 | 612,510,000 |  |  |  |
Limited partnership units issued |  |  |  |  |  |  |  |  |  |  |  |  | 152,886,000 |  |  |  |
Stockholders equity |  |  |  |  |  |  |  |  |  | 559,925,000 |  | 559,925,000 |  | 567,569,000 |  |  |
Redeemable partnership interests |  |  |  |  |  |  |  |  |  | 26,715,000 |  | 26,715,000 |  | 26,170,000 |  |  | $ 21,096,000
Mortgage servicing right recognized |  |  |  |  |  |  |  |  |  | 20,235,000 | 17,181,000 | 35,203,000 | 34,998,000 |  |  |  |
Management services, servicing fees and other |  |  |  |  |  |  |  |  |  | 160,256,000 | 144,909,000 | 301,298,000 | 275,720,000 |  |  |  |
Determination price | $ / shares | $ 4.2625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-exchangeable units redemption, value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |  |
Exchange share price | $ / shares | $ 6.20 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.17 |  |  |
Value of LPU issued in exchange | $ 9,870,501 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of withholding tax rate for common stock issue | $ 1,129,499 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment related to withholding tax rate for common shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64,471 |  |  |
Number od shares removed from sale restriction | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,229 |  |
Equity method investments |  |  |  |  |  |  |  |  |  | $ 106,010,000 |  | $ 106,010,000 |  | 101,275,000 |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction |  |  |  |  |  |  |  |  |  | 94.95% |  | 94.95% |  |  |  |  |
Purchase of units | shares |  |  |  |  | 16,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase value of units |  |  |  |  | $ 242,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Receivables from related parties |  |  |  |  |  |  |  |  |  | $ 1,200,000 |  | $ 1,200,000 |  | 20,500,000 |  |  |
Current portion of payables to related parties |  |  |  |  |  |  |  |  |  | $ 25,508,000 |  | $ 25,508,000 |  | $ 13,507,000 |  |  |
6.125% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000.0 |
Stated interest rate |  |  |  |  |  |  |  |  |  | 6.125% |  | 6.125% |  | 6.125% |  | 6.125% |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction |  | 46.3895% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate distribution of shares in spin-off | shares |  | 131,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  |  |  |  |  |  |  |  |  |  |  | 0.9495 |  |  |  |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction |  | 46.3895% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate distribution of shares in spin-off | shares |  | 21,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cantor And CFGM [Member] | Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Distributions of shares in spin-off |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CF Real Estate Finance Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investments |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |  |
BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-exchangeable units redeemed | shares | 1,131,774 |  |  |  |  |  |  |  |  |  |  |  |  | 264,985 |  |  |
Number of non-exchangeable psu approved redemption | shares | 1,131,774 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange share price | $ / shares | $ 6.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of LPU issued in exchange | $ 7,017,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued for non exchangeable PPSU | shares | 1,018,390 |  |  |  |  |  |  |  |  |  |  |  |  | 134,535 |  |  |
Number of net share issued for non exchangeable units redemption | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,552 |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction |  | 46.3895% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-Exchangeable PPSU [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination price | $ / shares | $ 7.8388 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of withholding tax rate for common stock issue | $ 7,983,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners Inc [Member] | Class A or Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Ratio Number of Common Shares Received Under Spin Off Transaction |  | 46.3895% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners Inc [Member] | Cantor And CFGM [Member] | Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common shares held by limited partners |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-exchangeable units redeemed | shares | 1,592,016 |  |  |  |  |  |  |  |  |  |  |  |  | 592,721 |  |  |
Determination price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.715 |  |  |
Non-exchangeable units redemption, value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |
Mr. Lutnick [Member] | Preferred Units [Member] | BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-exchangeable units redeemed | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 898,080,000 |  |  |
Determination price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.65 |  |  |
Mr. Gosin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.2625 |  |  |
Mr. Gosin [Member] | BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued for non exchangeable PPSU | shares | 264,985 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Gosin [Member] | Preferred Units [Member] | BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-exchangeable units redeemed | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,909,188 |  |  |
Mr. Rispoli [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.814 |  |  |
Number of non-exchangeable PSU approved cancellation | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,552,000 |  |  |
Number od shares removed from sale restriction | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,961 |  |
Mr. Rispoli [Member] | BGC Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-exchangeable PSU approved cancellation | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,089,000 |  |  |
BPF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  | 875,000,000.0 |  |  |  |  |  |  |  |  |  |
Business acquisition price paid in units |  |  |  |  |  |  | $ 3,200,000 |  |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  |  | Sep. 08, 2017 |  |  |  |  |  |  |  |  |  |
Business acquisition, transaction agreement date |  |  |  |  |  |  | Jul. 17, 2017 |  |  |  |  |  |  |  |  |  |
Intercompany Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate terms |  |  |  |  |  |  |  |  |  |  |  | The interest rate on the Intercompany Credit Agreement was the higher of BGC’s or Newmark’s short-term borrowings rate in effect at such time, plus 100 basis points, or such other interest rate as may be mutually agreed between BGC and Newmark. |  |  |  |  |
Intercompany Credit Agreement [Member] | Interest Expense, Net [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 2,700,000 |  | 3,600,000 |  |  |  |
Cantor and BGC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees to related parties |  |  |  |  |  |  |  |  |  | $ 7,200,000 | 6,300,000 | $ 13,900,000 | 13,200,000 |  |  |  |
Recognized related party revenues |  |  |  |  |  |  |  |  |  | 500,000 | 0 | 700,000 | 0 |  |  |  |
Employee Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans, forgivable loans and other receivables from employees and partners |  |  |  |  |  |  |  |  |  | 320,400,000 |  | 320,400,000 |  | $ 285,500,000 |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  |  | 11,100,000 | 5,200,000 | 18,500,000 | 11,200,000 |  |  |  |
CCRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fees to related parties |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |
Number of employees transferred | Employee |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from limited partnership units |  |  |  |  |  |  |  |  | $ 6,900,000 |  |  |  |  |  |  |  |
Issuance of additional limited partnership units with capital account |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |
Issuance of additional limited partners units in exchange for cash payment |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |
Issuance of additional limited partners units in exchange | shares |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |  |  |  |  |
Maximum revenue share to related party in first two years |  |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders equity |  |  |  |  |  |  |  |  |  | 6,900,000 |  | $ 6,900,000 |  |  |  |  |
Redeemable partnership interests |  |  |  |  |  |  |  |  |  | 2,200,000 |  | 2,200,000 |  |  |  |  |
CCRE [Member] | BPF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction agreement, distribution |  |  |  |  |  |  | $ 89,100,000 |  |  |  |  |  |  |  |  |  |
Net assets exceeded |  |  |  |  |  |  | $ 508,600,000 |  |  |  |  |  |  |  |  |  |
CCRE [Member] | Loan Referral Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from loan referral agreement |  |  |  |  |  |  |  |  |  | 200,000 | 100,000 | 900,000 | 3,700,000 |  |  |  |
Broker fees and commissions |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 200,000 | 700,000 |  |  |  |
CCRE [Member] | Primary Servicing Rights [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing rights of loans originated |  |  |  |  |  |  |  |  |  | 447,000,000.0 | 594,000,000.0 | 447,000,000.0 | 594,000,000.0 |  |  |  |
Purchase of loans originated |  |  |  |  |  |  |  |  |  |  |  | 700,000 | 1,000,000.0 |  |  |  |
Mortgage servicing right recognized |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |
Management services, servicing fees and other |  |  |  |  |  |  |  |  |  | $ 1,000,000.0 | $ 1,000,000.0 | 1,900,000 | $ 1,900,000 |  |  |  |
CCRE [Member] | Newmark Holdings, L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units issued |  |  |  |  |  |  |  |  | 6,700,000 |  |  |  |  |  |  |  |
Limited partnership unit cash distributions |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |
Cantor and its Affiliates (Other Than BGC) [Member] | GSE Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction maximum amount per loan |  |  |  |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |  |  |  |
Related party transaction limit on loan not yet acquired or sold |  |  |  |  |  |  |  | 250,000,000.0 |  |  |  |  |  |  |  |  |
Cantor and its Affiliates (Other Than BGC) [Member] | GSE Loans [Member] | Fannie Mae [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction limit on loan outstanding |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |  |
CF & Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of gross proceeds paid to underwriter |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |
Related party transaction, service fees paid |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000.0 |  |  |  |  |
CF & Co [Member] | Cantor Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate description |  | an interest rate which is the higher of CFLP’s or Newmark’s short-term borrowing rate then in effect, plus 1%. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CF & Co [Member] | 6.125% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 550,000,000.0 |
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.125% |
Debt instrument, underwriting fees paid to CF&Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000 |
BGC Partners, L.P. and its Operating Subsidiaries [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of units | shares |  |  |  |  | 16,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase value of units |  |  |  |  | $ 242,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Closing price per share | $ / shares |  |  |  |  | $ 14.57 |  |  |  |  |  |  |  |  |  |  |  |
Limited partners capital account units held by BGC | shares |  |  |  |  | 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of limited partnership units exchangeable | shares |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  |  |  |  | 0.9793 |  |  |  |  |  |  | 0.9495 |  |  |  |  |
BGC Partners, L.P. and its Operating Subsidiaries [Member] | Class A Common Stock [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class A or Class B common stock | shares |  |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners, L.P. and its Operating Subsidiaries [Member] | Class B Common Stock [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class A or Class B common stock | shares |  |  |  |  | 5,400,000 |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners, L.P. and its Operating Subsidiaries [Member] | Cantor [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate distribution of shares in spin-off | shares |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners, L.P. and its Operating Subsidiaries [Member] | Newmark OpCo [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interests units | shares |  |  |  |  | 7,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Limited partners capital account units held by BGC | shares |  |  |  |  | 7,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
BGC Partners, L.P. and its Operating Subsidiaries [Member] | Newmark OpCo [Member] | Class A Common Stock [Member] | Newmark Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, right to exchange from Class A to Class A or Class B common stock | shares |  |  |  |  | 6,900,000 |  |  |  |  |  |  |  |  |  |  |  |

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