XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.21.1

Securities Loaned | 3 Months Ended
--- | ---
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Securities Loaned | Securities LoanedAs of March 31, 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.

X
- Definition Securities loaned disclosure. + References No definition available. + Details
Name: | nmrk_SecuritiesLoanedDisclosureTextBlock
Namespace Prefix: | nmrk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration