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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Details) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share issuances:
Other (in shares)	(155,240)	13,521
Class A Common Stock
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)	150,384,605	168,272,371
Share issuances:
LPU redemption/exchange (in shares)	1,927,905	934,868
Treasury stock repurchases (in shares)	0	(1,682,871)
Shares outstanding at end of period (in shares)	153,142,810	168,557,363
Class A Common Stock | Restricted Stock Units
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)	985,540	1,019,474

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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