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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Schedule of segment reporting information, by segment Newmark recognized revenues as follows (in thousands): 
 Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Leasing and other commissions$184,346 $120,079 $331,779 $260,517 
Capital markets commissions184,756 52,959 306,159 180,882 
Gains from mortgage banking activities/origination, net41,260 69,071 88,653 119,494 
Management services, servicing fees and other219,509 141,609 407,260 306,754 
Revenues$629,871 $383,718 $1,133,851 $867,647