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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Schedule of Revenue by Segment Newmark recognized revenues as follows (in thousands): 
 Year Ended December 31,
 202220212020
Management services, servicing fees and other$909,485 $915,715 $626,136 
Leasing and other commissions831,874 826,942 513,842 
Investment sales606,416 757,744 403,971 
Commercial mortgage origination, net357,752 406,042 361,049 
Revenues$2,705,527 $2,906,443 $1,904,998