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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative contract, Assets |  | $ 73,448 | $ 92,528
Derivative contract, Liabilities |  | 29,689 | 16,678
Derivative contract, Notional Amounts |  | 2,435,513 | 1,814,834
Forwards [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative contract, Assets | [1] | 51,497 | 85,796
Derivative contract, Liabilities |  | 27,261 | 9,208
Derivative contract, Notional Amounts | [2] | 1,794,842 | 1,574,114
Rate Lock Commitments [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Derivative contract, Assets |  | 21,951 | 6,732
Derivative contract, Liabilities |  | 2,428 | 7,470
Derivative contract, Notional Amounts |  | $ 640,671 | $ 240,720
[1] | Included in Forwards is $48.7 million and $77.6 million of the Nasdaq Forwards as of June 30, 2019 and December 31, 2018, respectively (See Note 1 — Organization and Basis of Presentation). Newmark recorded $29.0 million and $(19.0) million of unrealized (gains)/losses for a change in the fair value of the Nasdaq Forwards as of June 30, 2019 and December 31, 2018, respectively.
[2] | 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. Included in the notional amounts of forwards is $361.0 million for the Nasdaq Forwards as of June 30, 2019 and December 31, 2018.

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