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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Schedule of segment reporting information, by segment Newmark recognized revenues as follows (in thousands): 
 Three Months Ended March 31,
 20212020
Leasing and other commissions$147,433 $140,439 
Capital markets commissions121,403 127,923 
Gains from mortgage banking activities/origination, net47,393 50,422 
Management services, servicing fees and other187,751 165,146 
Revenues$503,980 $483,930