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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2023
Accounting Policies [Abstract]  
Schedule of Revenue by Segment Newmark recognized revenues as follows (in thousands): 
 Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
Management services, servicing fees and other$240,660 $233,685 $452,952 $466,804 
Leasing and other commissions203,611 212,825 396,917 411,778 
Investment sales 77,604 209,053 149,597 361,167 
Commercial mortgage origination, net63,969 99,788 107,177 193,850 
Revenues$585,844 $755,351 $1,106,643 $1,433,599