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Compensation - Schedule of Activity Associated with Restricted Stock Units (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Newmark Holdings, L.P.    
Restricted Stock Units    
Beginning balance (in shares) 10,977,725 12,133,105
Number of units, Granted (in shares) 3,023,455 2,838,998
Number of Settled units (delivered shares) (in shares) (3,994,549) (3,118,150)
Number of Units, Forfeited units (in shares) (329,858) (876,228)
Ending balance (in shares) 9,676,773 10,977,725
Weighted- Average Grant Date Fair Value Per Share    
Balance at the beginning of period (in dollars per share) $ 8.91 $ 8.59
Granted (in dollars per share) 11.84 9.92
Settled units (delivered shares) (in dollars per share) 8.80 8.61
Forfeited units (in dollars per share) 9.86 8.89
Balance at the end of period (in dollars per share) $ 9.84 $ 8.91
Fair Value Amount    
Balance at beginning of period $ 97,771 $ 104,251
Granted 35,802 28,159
Settled units (delivered shares) (35,147) (26,850)
Forfeited units (3,253) (7,789)
Balance at end of period $ 95,173 $ 97,771
Number of shares authorized to be repurchased (in shares) 57,886,000 36,992,000
Newmark Holdings, L.P. | Minimum    
Fair Value Amount    
Award vesting period 3 years  
Newmark Holdings, L.P. | Maximum    
Fair Value Amount    
Award vesting period 8 years  
BGC Holdings, L.P.    
Restricted Stock Units    
Beginning balance (in shares) 3,586 4,883
Number of units, Granted (in shares) 0 19,425
Number of Settled units (delivered shares) (in shares) (1,316) (1,243)
Number of Units, Forfeited units (in shares) 0 (19,479)
Ending balance (in shares) 2,270 3,586
Weighted- Average Grant Date Fair Value Per Share    
Balance at the beginning of period (in dollars per share) $ 4.08 $ 4.22
Granted (in dollars per share) 0 6.87
Settled units (delivered shares) (in dollars per share) 4.28 4.28
Forfeited units (in dollars per share) 0 6.88
Balance at the end of period (in dollars per share) $ 3.96 $ 4.08
Fair Value Amount    
Balance at beginning of period $ 15 $ 21
Granted 0 133
Settled units (delivered shares) (6) (5)
Forfeited units 0 (134)
Balance at end of period $ 9 $ 15
Number of shares authorized to be repurchased (in shares) 12,000 10,000
BGC Holdings, L.P. | Minimum    
Fair Value Amount    
Award vesting period 2 years  
BGC Holdings, L.P. | Maximum    
Fair Value Amount    
Award vesting period 3 years