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Securities Loaned	6 Months Ended
	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Securities Loaned	Securities LoanedAs of June 30, 2021, Newmark did not have Securities loaned with Cantor. As of December 31, 2020, Newmark had Securities loaned with Cantor of $33.3 million. The market value of the Securities loaned as of December 31, 2020 were $32.6 million. The cash collateral received from Cantor bore an interest rate of 0.85% as of December 31, 2020, respectively.

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