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Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under U.S. GAAP Guidance (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |  |
Marketable securities |  | $ 33,659 | $ 48,942
Loans held for sale, at fair value |  | 818,909 | 990,864
Derivative contract, Assets |  | 73,448 | 92,528
Total assets |  | 926,016 | 1,132,334
Liabilities: |  |  |
Accounts payable, accrued expenses and other liabilities—contingent consideration |  | 38,712 | 32,552
Derivative contract, Liabilities |  | 29,689 | 16,678
Total Liabilities |  | 68,401 | 49,230
Forward Contracts [Member] |  |  |
Assets: |  |  |
Derivative contract, Assets | [1] | 51,497 | 85,796
Liabilities: |  |  |
Derivative contract, Liabilities |  | 27,261 | 9,208
Rate Lock Commitments [Member] |  |  |
Assets: |  |  |
Derivative contract, Assets |  | 21,951 | 6,732
Liabilities: |  |  |
Derivative contract, Liabilities |  | 2,428 | 7,470
Forward Sale Contracts [Member] |  |  |
Assets: |  |  |
Derivative contract, Assets |  | 2,845 | 8,177
Liabilities: |  |  |
Derivative contract, Liabilities |  | 27,261 | 9,208
NASDAQ [Member] | Forward Contracts [Member] |  |  |
Assets: |  |  |
Nasdaq Forwards |  | 48,652 | 77,619
Level 1 [Member] |  |  |
Assets: |  |  |
Marketable securities |  | 33,659 | 48,942
Total assets |  | 33,659 | 48,942
Level 2 [Member] |  |  |
Assets: |  |  |
Loans held for sale, at fair value |  | 818,909 | 990,864
Total assets |  | 818,909 | 990,864
Level 3 [Member] |  |  |
Assets: |  |  |
Total assets |  | 73,448 | 92,528
Liabilities: |  |  |
Accounts payable, accrued expenses and other liabilities—contingent consideration |  | 38,712 | 32,552
Total Liabilities |  | 68,401 | 49,230
Level 3 [Member] | Rate Lock Commitments [Member] |  |  |
Assets: |  |  |
Derivative contract, Assets |  | 21,951 | 6,732
Liabilities: |  |  |
Derivative contract, Liabilities |  | 2,428 | 7,470
Level 3 [Member] | Forward Sale Contracts [Member] |  |  |
Assets: |  |  |
Derivative contract, Assets |  | 2,845 | 8,177
Liabilities: |  |  |
Derivative contract, Liabilities |  | 27,261 | 9,208
Level 3 [Member] | NASDAQ [Member] | Forward Contracts [Member] |  |  |
Assets: |  |  |
Nasdaq Forwards |  | $ 48,652 | $ 77,619
[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.

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