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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Schedule of Segment Reporting Information, by Segment For the three months ended March 31, 2020 and 2019, Newmark recognized revenues as follows (in thousands): 
 
Three months ended March 31,
 
2020
 
2019
Leasing and other commissions
$
140,439

 
$
172,471

Capital markets commissions
127,923

 
102,797

Gains from mortgage banking activities/origination, net
50,422

 
31,346

Management services, servicing fees and other
165,146

 
141,042

Revenues
$
483,930

 
$
447,656