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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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