Schedule I - Parent Company Only - Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable
Corporate taxes payable	$ 25,666	$ 69,237
Total	326,548	417,069
NEWMARK Group Inc Parent
Accounts, Notes, Loans and Financing Receivable
Corporate taxes payable	22,692	67,700
Accrued interest	4,841	4,369
Other	3,185	2,495
Total	$ 30,718	$ 74,564