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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Details) - shares
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
Aug. 31, 2022
Jul. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share issuances:                  
Other (in shares)       (26,742)          
Class A Common Stock                  
Increase (Decrease) in Stockholders' Equity                  
Shares outstanding at beginning of period (in shares)     160,002,640 160,002,640   168,272,371 179,736,458 168,272,371 161,175,894
Share issuances:                  
LPU redemption/exchange (in shares)       421,320     968,762 3,751,231 3,960,927
Other (in shares)             (244,815) 38,093 18,572,317
Treasury stock repurchases (in shares) (4,436,461) (3,337,037) (2,390,179) (10,163,677) (11,370,647) (1,682,871) (6,307,802) (23,217,195) (10,800,143)
Shares outstanding at end of period (in shares) 150,530,807     150,530,807 160,002,640   174,407,338 150,530,807 174,407,338
Class A Common Stock | Restricted Stock Units                  
Share issuances:                  
Issuance of Class A common stock for Newmark RSUs (in shares)       297,266     254,735 1,686,307 1,498,343