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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