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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Detail) - shares	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share issuances:
Other (in shares)	18,817,132			18,817,132
Common Class A
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)	163,113,922	161,175,894	156,701,746	161,175,894	156,265,461
Share issuances:
LPU redemption/exchange (in shares)	1,140,363		827,847	2,992,165	1,009,719
Other (in shares)			0		0
Treasury stock repurchases (in shares)	(3,613,098)	(879,243)	0	(4,492,341)
Shares outstanding at end of period (in shares)	179,736,458	163,113,922	157,811,436	179,736,458	157,811,436
Common Class A | Restricted Stock Units (RSUs)
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)	278,139		281,843	1,243,608	536,256

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