Stock Transactions and Unit Purchases - Schedule of Changes in Shares of Common Stock Outstanding (Details) - Class A Common Stock - shares	1 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2026	May 31, 2026	Apr. 30, 2026	Jun. 30, 2026	Mar. 31, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)			155,988,950	155,988,950	160,656,704	161,924,550	160,656,704	149,506,832
Share issuances:
LPU redemption/exchange (in shares)				3,793,688		2,500,090	7,031,930	13,050,619
Other (in shares)				9,264		(33,427)	365,901	463,207
Treasury stock repurchases (in shares)	0	0	(988,178)	(988,178)	(9,379,317)	(10,839,674)	(10,367,495)	(10,839,674)
Shares outstanding at end of period (in shares)	159,286,586			159,286,586	155,988,950	154,352,509	159,286,586	154,352,509
Restricted Stock Units
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)				482,862		800,970	1,599,546	2,171,525

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

Number of new stock issued during the period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

- Definition

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

+ References

+ Details

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

+ Details