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Limited Partnership Interests in Newmark Holdings and BGC Holdings (Details)	3 Months Ended					12 Months Ended
	Mar. 31, 2021 tranche shares	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 13, 2017
Related Party Transaction
Payout period for post-termination awards	4 years
Percentage to preferred units (in percentage)		0.6875%	0.6875%	0.6875%	0.6875%	2.75%
Non Distribution Earning Units
Related Party Transaction
Award vesting period (in years)	4 years
Common Class A
Related Party Transaction
Limited partnership units exchange ratio (in percentage)							1
Common Class B | Cantor
Related Party Transaction
Exchangeable partnership units (in shares)	23,700,000
Share converted (in shares)	1
Newmark OpCo | RBC
Related Party Transaction
Exchangeable preferred limited partnership units, number of tranches | tranche	4
NEWMARK Group Inc Parent | Common Class A
Related Party Transaction
Limited partnership units exchange ratio (in percentage)	0.9365

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