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Long-Term Debt - Credit Facility Narratives (Details) - USD ($)				3 Months Ended
	Mar. 16, 2020	Feb. 26, 2020	Nov. 28, 2018	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Line of Credit Facility
Proceeds from warehouse facilities				$ 2,164,595,000	$ 2,545,715,000
Repayments of lines of credit				2,408,764,000	$ 2,052,041,000
Line of Credit | Revolving Credit Facility
Line of Credit Facility
Maximum revolving credit	$ 465,000,000.0	$ 425,000,000.0
Long-term debt term (in years)			3 years
Proceeds from warehouse facilities				30,000,000.0
Repayments of lines of credit				$ 30,000,000.0
Stated interest rate (in percentage)				1.86%		2.53%
Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Maximum revolving credit			$ 250,000,000.0
LIBOR | Line of Credit | Revolving Credit Facility
Line of Credit Facility
Basis spread on variable rate (in percentage)	1.75%	1.75%
Interest Rate Option One | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			1.00%
Interest Rate Option Two | Federal Funds Rate | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			0.50%
Interest Rate Option Two | One-month LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			1.00%
Interest Rate Option Two | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			2.00%
Minimum | Interest Rate Option One | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			0.25%
Minimum | Interest Rate Option Two | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			1.25%
Maximum | Interest Rate Option One | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			1.25%
Maximum | Interest Rate Option Two | LIBOR | Line of Credit | Revolving Credit Facility | NEWMARK Group Inc Parent
Line of Credit Facility
Basis spread on variable rate (in percentage)			2.25%
Weighted Average | Line of Credit | Revolving Credit Facility
Line of Credit Facility
Interest rate in the period (in percentage)				1.88%	3.43%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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