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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Detail) - shares	1 Months Ended		3 Months Ended
	Feb. 28, 2021	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Share issuances:
Other (in shares)			0
Common Class A
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)		161,175,894	161,175,894	156,265,461
Share issuances:
LPU redemption/exchange (in shares)			1,851,802	181,872
Other (in shares)				0
Treasury stock repurchases (in shares)	0	0	(879,243)	0
Shares outstanding at end of period (in shares)			163,113,922	156,701,746
Common Class A | Restricted Stock Units (RSUs)
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)			965,469	254,413

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Exchange or redemption for limited partnership unit.

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

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