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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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