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Condensed Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Commercial Real Estate Consulting Firm [Member]
Smith Mack [Member]
Berkeley Point [Member]
Newmark [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Smith Mack [Member]
Additional Paid-in Capital [Member]
Berkeley Point [Member]
Additional Paid-in Capital [Member]
Newmark [Member]
Contingent Class A Common Stock [Member]
Contingent Class A Common Stock [Member]
Smith Mack [Member]
Treasury Stock [Member]
Retained Deficit [Member]
Retained Deficit [Member]
Berkeley Point [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest in Subsidiaries [Member]
Noncontrolling Interest in Subsidiaries [Member]
Commercial Real Estate Consulting Firm [Member]
Noncontrolling Interest in Subsidiaries [Member]
Smith Mack [Member]
Noncontrolling Interest in Subsidiaries [Member]
Berkeley Point [Member]
Noncontrolling Interest in Subsidiaries [Member]
Newmark [Member]
Class A Common Stock [Member]
Class A Common Stock [Member]
Smith Mack [Member]
Class B Common Stock [Member]
Beginning Balance at Dec. 31, 2016 $ 1,633,540         $ 1,662,615       $ 42,472   $ (288,743) $ (212,858)   $ (23,199) $ 449,980         $ 2,925   $ 348
Consolidated net income (loss) 81,729                       51,475     30,254              
Other comprehensive gain, net of tax 14,852                           12,713 2,139              
Equity-based compensation 2,137         1,370                   761         6    
Dividends to common stockholders (200,116)                       (200,116)                    
Earnings distributions to limited partnership interests and other noncontrolling interests (118,795)                             (118,795)              
Grant of exchangeability and redemption of limited partnership interests 203,199         125,502                   77,605         92    
Issuance of Class A common stock (net of costs) 57,721         45,101                   12,600         20    
Redemption of FPUs (6,665)                             (6,665)              
Repurchase of Class A common stock (16,773)                     (13,164)       (3,609)              
Forfeitures of restricted Class A common stock (1,153)         1,063           (1,966)       (250)              
Cantor purchase of Cantor units from BGC Holdings upon redemption of founding/working partners units 3,920                             3,920              
Issuance of Class A common stock for acquisitions     $ 2,662       $ 8,037       $ (5,961)             $ 566       $ 20  
Issuance of contingent shares and limited partnership interests in connection with acquisitions 11,570         5,121       3,961           2,488              
Acquisition (89,149)                       (56,483)     (32,666)              
Noncontrolling Interest Decrease From Business Combination       $ (766,406)       $ (87,434)           $ (441,386)         $ (237,586)        
Noncontrolling Interest, Increase from Business Combination         $ 305,420                             $ 305,420      
Purchase of noncontrolling interest   $ 18,056     (315)       $ (175)               $ 18,056     (140)      
Other 4,307         2,171             359     1,777              
Ending Balance at Dec. 31, 2017 1,139,741         1,763,371       40,472   (303,873) (859,009)   (10,486) 505,855         3,063   348
Consolidated net income (loss) 97,431                       58,774     38,657              
Other comprehensive gain, net of tax 4,657                           4,025 632              
Equity-based compensation 1,292         836                   453         3    
Dividends to common stockholders (55,576)                       (55,576)                    
Earnings distributions to limited partnership interests and other noncontrolling interests (51,225)                             (51,225)              
Grant of exchangeability and redemption of limited partnership interests 53,933         35,475                   18,430         28    
Issuance of Class A common stock (net of costs) 231,050         181,272                   49,589         189    
Redemption of FPUs 171                             171              
Issuance of Class A common stock for acquisitions 4,027         3,334       (174)           864         3    
Noncontrolling Interest Decrease From Business Combination         (4,897)                             (4,897)      
Purchase of noncontrolling interest         $ (100)                             $ (100)      
Cumulative effect of standard adoption | Revenue [Member] 18,690                       16,387     2,303              
Cumulative effect of standard adoption | Equity Investments [Member]                         1,671   (2,293) 622              
Other 8         9                   (1)              
Ending Balance at Mar. 31, 2018 $ 1,439,202         $ 1,984,297       $ 40,298   $ (303,873) $ (837,753)   $ (8,754) $ 561,353         $ 3,286   $ 348