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Credit Enhancement Receivable, Contingent Liability and Credit Enhancement Deposit - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit [Line Items] |  |  |  |  |
Credit enhancement agreement date |  |  | Mar. 09, 2012 |  |
Credit enhancement receivable | $ 0 |  | $ 0 |  | $ 0
Deposit in Fannie Mae restricted liquidity account | 25,000,000 |  | 25,000,000 |  |
Deposit in Fannie Mae restricted liquidity account | 25,000,000 |  | $ 25,000,000 |  | 25,000,000
Security deposit return date |  |  | Mar. 09, 2021 |  |
Other Long-Term Liabilities [Member] |  |  |  |  |
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit [Line Items] |  |  |  |  |
Deposit in Fannie Mae restricted liquidity account | 25,000,000 |  | $ 25,000,000 |  |
Credit Risk [Member] |  |  |  |  |
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit [Line Items] |  |  |  |  |
Credit risk loans | 20,300,000,000 |  | 20,300,000,000 |  | 20,600,000,000
Maximum pre-credit enhancement loss exposure | 5,700,000,000 |  | 5,700,000,000 |  | 5,800,000,000
DB Cayman [Member] | Credit Risk [Member] |  |  |  |  |
Credit Enhancement Receivable Contingent Liability And Credit Enhancement Deposit [Line Items] |  |  |  |  |
Reimbursements under serving agreement | 0 | $ 0 | 0 | $ 0 |
Credit risk loans | $ 29,600,000 |  | 29,600,000 |  | 230,700,000
Maximum pre-credit enhancement loss exposure |  |  | 9,900,000 |  | 76,200,000
Maximum loss exposure without any form of credit protection |  |  | $ 5,700,000,000 |  | 5,700,000,000
Percentage of contingent payment | 50.00% |  | 50.00% |  |
Contingent payment due date |  |  | Mar. 09, 2021 |  |
Contingent payments description |  |  | Newmark is required to pay DB Cayman, on March 9, 2021, an amount equal to 50% of the positive difference, if any, between (a) $25 million, and (b) Newmark’s unreimbursed loss-sharing payments from March 9, 2012 through March 9, 2021 on Newmark’s servicing portfolio as of March 9, 2012. |  |
Contingent liability | $ 11,500,000 |  | $ 11,500,000 |  | $ 11,100,000

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- Definition Contingent payment due date. + References No definition available. + Details
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- Definition Contingent payments description. + References No definition available. + Details
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- Definition Credit enhancement agreement date. + References No definition available. + Details
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- Definition Credit enhancement receivable. + References No definition available. + Details
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- Definition Credit enhancement receivable contingent liability and credit enhancement deposit. + References No definition available. + Details
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- Definition Percentage of contingent payment. + References No definition available. + Details
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- Definition Security deposit return date. + References No definition available. + Details
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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 + Details
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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + Details
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- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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