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Organization and Basis of Presentation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 11 Months Ended 12 Months Ended
Nov. 30, 2018
shares
Nov. 23, 2018
USD ($)
Nov. 23, 2018
USD ($)
Nov. 07, 2018
USD ($)
Sep. 05, 2018
USD ($)
Dec. 26, 2017
shares
Dec. 15, 2017
$ / shares
shares
Sep. 08, 2017
USD ($)
Nov. 30, 2018
Segment
shares
Dec. 31, 2019
USD ($)
Segment
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
shares
Jan. 01, 2019
USD ($)
Mar. 19, 2018
USD ($)
Jan. 01, 2018
USD ($)
Description Of Business [Line Items]                              
Equity method investments                   $ 40,000 $ 35,211        
Number of reporting segments | Segment                 2 1          
Retained deficit                   $ (1,241,754) (1,105,019)        
Accumulated other comprehensive income (loss)                   (33,102) (24,465)        
Noncontrolling interest in subsidiaries                   57,911 $ 94,801        
Operating lease, right-of-use asset [1]                   169,065          
Operating lease, liability [1]                   $ 187,398          
ASU No. 2018-03 [Member]                              
Description Of Business [Line Items]                              
Retained deficit                             $ 2,100
Accumulated other comprehensive income (loss)                             2,900
Noncontrolling interest in subsidiaries                             800
ASU No. 2018-03 [Member] | Retained Deficit [Member]                              
Description Of Business [Line Items]                              
Tax effect impact for increase or decrease to the liability                             400
ASU No. 2018-03 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]                              
Description Of Business [Line Items]                              
Tax effect impact for increase or decrease to the liability                             600
ASU No. 2018-03 [Member] | Noncontrolling Interest in Subsidiaries [Member]                              
Description Of Business [Line Items]                              
Tax effect impact for increase or decrease to the liability                             $ 200
ASU No. 2016-02 [Member]                              
Description Of Business [Line Items]                              
Operating lease, right-of-use asset                         $ 192,400    
Operating lease, liability                         $ 206,000    
BGC Holdings Partnership Unit [Member]                              
Description Of Business [Line Items]                              
Exchangeable limited partnership units | shares 1,458,931                            
Newmark [Member]                              
Description Of Business [Line Items]                              
Percentage of voting power 94.00%               94.00%            
Percentage of economics of outstanding common stock 87.00%               87.00%            
Revolving Credit Agreement [Member]                              
Description Of Business [Line Items]                              
Line of credit facility, borrowing amount                           $ 150,000  
Intercompany Credit Agreement [Member]                              
Description Of Business [Line Items]                              
Line of credit facility, borrowing amount                           $ 150,000  
8.125% Senior Notes Due 2042 [Member]                              
Description Of Business [Line Items]                              
Stated interest rate         8.125%                    
Debt maturity year         2042                    
5.375% Senior Notes Due 2019 [Member]                              
Description Of Business [Line Items]                              
Stated interest rate   5.375% 5.375%                        
Debt maturity year   2019               2019          
Repayments of outstanding borrowings     $ 300,000                        
Class A Common Stock [Member]                              
Description Of Business [Line Items]                              
Issuance of Class A common stock (net of costs), shares | shares                   212,711 26,003,424 1,994,670      
Common stock, shares issued | shares                   358,440,000 341,745,000        
Class A Common Stock [Member] | Newmark [Member]                              
Description Of Business [Line Items]                              
Stockholders received on per share 0.463895                            
Common stock, shares issued | shares 131,886,409               131,886,409            
Class A Common Stock [Member] | Newmark [Member] | Cantor [Member]                              
Description Of Business [Line Items]                              
Common stock, shares issued | shares 449,917               449,917            
Class B Common Stock [Member]                              
Description Of Business [Line Items]                              
Issuance of Class A common stock (net of costs), shares | shares                   0          
Common stock, shares issued | shares                   45,884,000 45,884,000        
Class B Common Stock [Member] | Newmark [Member]                              
Description Of Business [Line Items]                              
Stockholders received on per share 0.463895                            
Common stock, shares issued | shares 21,285,537               21,285,537            
Exchange ratio 0.9400                            
Real Estate L.P.                              
Description Of Business [Line Items]                              
Equity method investments               $ 100,000              
BPF [Member]                              
Description Of Business [Line Items]                              
Business acquisition date               Jul. 17, 2017              
Business acquisition effective date               Sep. 08, 2017              
Newmark [Member] | Intercompany Credit Agreement [Member]                              
Description Of Business [Line Items]                              
Repayments of outstanding borrowings       $ 150,000                      
Newmark [Member] | 8.125% Senior Notes Due 2042 [Member]                              
Description Of Business [Line Items]                              
Repayments of outstanding borrowings         $ 112,500                    
Newmark [Member] | 5.375% Senior Notes Due 2019 [Member]                              
Description Of Business [Line Items]                              
Repayments of outstanding borrowings   $ 300,000                          
Newmark [Member] | IPO [Member] | Class A Common Stock [Member]                              
Description Of Business [Line Items]                              
Issuance of Class A common stock (net of costs), shares | shares             20,000,000                
Closing price per share | $ / shares             $ 14.00                
Options to purchase additional shares of common stock period             30 days                
Option to purchase additional shares | shares           3,000,000                  
[1] As of December 31, 2019, $169.1 million and $187.4 million, relating to lease ROU assets and lease liabilities, respectively, is attributable to the adoption of ASU No. 2016-02, Leases (Topic 842). See Note 25—“Leases”, in addition to the information under the heading “Recently Adopted Accounting Pronouncements” included in Note 1—“Organization and Basis of Presentation” for additional information.