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Related Party Transactions - Transactions With Executive Officers and Directors (Details)				1 Months Ended		3 Months Ended
	Apr. 27, 2021 USD ($) $ / shares shares	Mar. 26, 2021 USD ($) shares	Mar. 16, 2021 USD ($) $ / shares shares	Feb. 28, 2021 $ / shares shares	Jan. 31, 2021 $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) shares
Related Party Transaction
Fees to related parties | $						$ 6,250,000	$ 5,812,000
Stock issued, value | $						$ 4,025,000
Common Class A
Related Party Transaction
Treasury stock repurchases (in shares)				0	0	879,243	0
Shares repurchased price (in dollars per share) | $ / shares				$ 0	$ 0	$ 10.57
Mr. Lutnick
Related Party Transaction
Stock issued, value | $			$ 21,555,069
Mr. Lutnick | Common Class A | Subsequent Event
Related Party Transaction
Stock issued (in shares)	5,154
Shares repurchased price (in dollars per share) | $ / shares	$ 10.67
Mr. Lutnick | PSU
Related Party Transaction
Stock issued (in shares)			4,423,457
Mr. Lutnick | Non Exchangeable PPSU
Related Party Transaction
Stock issued (in shares)			1,770,016
Mr. Gosin
Related Party Transaction
Shares issued (in dollars per share) | $ / shares			$ 11.09
PSU conversion ratio (per share)			0.9365
Value of LPU issued in exchange | $		$ 5,792,139
Mr. Gosin | Common Class A
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)			178,232
Mr. Gosin | Common Class A | Newmark Units
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)			82,680
Mr. Gosin | PSU
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)			526,828
Mr. Gosin | Non Exchangeable A P S U
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)			30,871
Mr. Merkel
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)			30,926
Shares issued (in dollars per share) | $ / shares			$ 11.09
Payment of withholding tax rate for common stock issue | $			$ 321,189
Mr. Merkel | Subsequent Event
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)	145,384
Payment of withholding tax rate for common stock issue | $	$ 815,878
Number of share issued for non exchangeable PPSU (in shares)	86,649
Shares repurchased price (in dollars per share) | $ / shares	$ 10.67
Mr. Merkel | Common Class A
Related Party Transaction
Stock issued (in shares)			28,962
Mr. Merkel | Common Class A | Subsequent Event
Related Party Transaction
Treasury stock repurchases (in shares)	68,727
Mr. Merkel | PSU | Subsequent Event
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)	73,387
Mr. Merkel | Non Exchangeable PPSU | Subsequent Event
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)	19,426
Payment of withholding tax rate for common stock issue | $	$ 173,863
Mr. Rispoli
Related Party Transaction
Value of LPU issued in exchange | $			$ 62,758
Mr. Rispoli | Common Class A
Related Party Transaction
Shares issued (in dollars per share) | $ / shares			$ 11.09
PSU conversion ratio (per share)			0.9365
Preferred Units | Mr. Rispoli
Related Party Transaction
Number of non exchangeable P S U redeemed (in shares)		6,043
Payment of withholding tax rate for common stock issue | $			$ 76,407
Number of share issued for non exchangeable PPSU (in shares)			4,907
Determination price (in dollars per share) | $ / shares			$ 15.57

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