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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative contract, Assets $ 18,437 $ 6,676
Derivative contract, Liabilities 11,401 3,047
Forwards [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative contract, Assets 9,687 3,753
Derivative contract, Liabilities 2,421 657
Derivative contract, Notional Amounts [1] 1,324,711 541,359
Rate Lock Commitments [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative contract, Assets 8,750 2,923
Derivative contract, Liabilities 8,980 2,390
Derivative contract, Notional Amounts [1] $ 374,197 $ 180,918
[1] Notional amounts represent the sum of gross long and short derivative contracts, an indication of the volume of Newmark’s derivative activity, and does not represent anticipated losses.