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Related Party Transactions - Other Related Party Transactions and Cantor Rights to Purchase Cantor Units from Newmark Holdings (Details)						1 Months Ended	3 Months Ended
	Apr. 16, 2023 USD ($) shares	Oct. 25, 2022 USD ($) shares	May 17, 2022 USD ($) shares	Jun. 28, 2021 USD ($)	Nov. 30, 2018 USD ($)	Jan. 31, 2022 USD ($) ft²	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jul. 31, 2022	Nov. 06, 2018	Dec. 13, 2017
Related Party Transaction
Payables to related parties							$ 1,299,000		$ 9,745,000
Operating lease payments							$ 29,900,000	$ 27,700,000
Limited partnership units exchange ratio							0.4545
Maximum
Related Party Transaction
Remaining lease terms							11 years
Options to extend leases							10 years
Knotel, Inc.
Related Party Transaction
Due from related party, percentage from sale							10.00%
Common Stock
Related Party Transaction
Limited partnership units exchange ratio											1
Class A Common Stock
Related Party Transaction
Limited partnership units exchange ratio												1
Class A Common Stock | NEWMARK Group Inc Parent
Related Party Transaction
Limited partnership units exchange ratio							0.9252
Cantor | Founding partner interest
Related Party Transaction
Stock issued (in shares) | shares		104,701	184,714
Proceeds from sales of partnership interest		$ 446,647	$ 763,064
Cantor | Founding partner interest | Subsequent Event
Related Party Transaction
Stock issued (in shares) | shares	309,631
Proceeds from sales of partnership interest	$ 1,282,265
Cantor | Limited partner interest
Related Party Transaction
Stock issued (in shares) | shares		102,454	23,562
Proceeds from sales of partnership interest		$ 272,100	$ 100,079
Cantor | Limited partner interest | Subsequent Event
Related Party Transaction
Stock issued (in shares) | shares	38,989
Proceeds from sales of partnership interest	$ 166,364
Affiliated Persons or Entities | RKF Retail Holdings LLC | Sublease Agreeement
Related Party Transaction
Remaining lease terms						6 months
Area of real estate property | ft²						21,000
Options to extend leases										1 year
Affiliated Persons or Entities | Cantor
Related Party Transaction
Monthly payment on sublease						$ 81,600
Operating lease payments							$ 300,000	$ 200,000
Employee of chairman
Related Party Transaction
Annual base salary				$ 125,000
Employee of chairman | Maximum
Related Party Transaction
Annual discretionary bonus rate				30.00%
Employee
Related Party Transaction
Travel and housing reimbursement				$ 250,000
Cantor Credit Agreement | Cantor
Related Party Transaction
Maximum revolving credit					$ 250,000,000
Basis spread on variable rate					1.00%

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