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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
Nov. 30, 2018
Segment
shares
Dec. 31, 2020
USD ($)
Individual
Segment
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Jan. 01, 2020
USD ($)
Jan. 01, 2019
USD ($)
Mar. 19, 2018
USD ($)
Jan. 01, 2018
USD ($)
Description Of Business [Line Items]                              
Number of individuals included in perpetrated | Individual                 2            
Cumulative impact on net income (loss) as a result of theft                 $ 35,200            
Number of reporting segments | Segment               2 1            
Retained deficit                 $ (1,265,504) $ (1,253,089)         $ (866,875)
Accumulated other comprehensive income (loss)                 (28,930) (33,102)          
Noncontrolling interest in subsidiaries                 59,290 50,321         501,208
Operating lease, right-of-use asset [1]                 165,969 169,065          
Operating lease, liability [1]                 190,207 $ 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] | Revision of Prior Period, Change in Accounting Principle, Adjustment [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] | Revision of Prior Period, Change in Accounting Principle, Adjustment [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] | Revision of Prior Period, Change in Accounting Principle, Adjustment [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    
ASU No. 2016-13 [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Assets [Member]                              
Description Of Business [Line Items]                              
Tax effect impact for increase or decrease to the liability                 600     $ 1,900      
ASU No. 2016-13 [Member] | Retained Deficit [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]                              
Description Of Business [Line Items]                              
Tax effect impact for increase or decrease to the liability                 400     1,300      
ASU No. 2016-13 [Member] | Noncontrolling Interest in Subsidiaries [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]                              
Description Of Business [Line Items]                              
Tax effect impact for increase or decrease to the liability                 $ 200     $ 600      
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                 390,570 212,711 26,003,424        
Common stock, shares issued | shares                 373,545,000 358,440,000          
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 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                 0.9379            
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, 2020, $166.0 million and $190.2 million, relating to lease ROU assets and lease liabilities, respectively, is attributable to the adoption of ASU No. 2016-02, Leases (Topic 842). 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 27—“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.