Related-Party Transactions - Additional Information (Detail) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
Dec. 31, 2018 |
|
| Related Party Transaction [Line Items] | |||
| Operating lease cost | $ 5,909,000 | ||
| Aggregate principal amount for employee notes receivable | 414,000 | $ 526,000 | |
| MMC [Member] | |||
| Related Party Transaction [Line Items] | |||
| Real estate brokerage commissions and financing fees from transactions with subsidiaries of Marcus & Millichap Company | 882,000.0 | $ 2,600,000 | |
| Commission expenses for transactions with subsidiaries of Marcus & Millichap Company | 522,000.0 | 1,500,000 | |
| Operating lease cost | $ 333,000 | 253,000 | |
| Lease expiration date | May 31, 2022 | ||
| Accounts payable and other liabilities - related party | $ 103,000 | $ 101,000 | |
| MMC [Member] | Transition Services Agreement [Member] | |||
| Related Party Transaction [Line Items] | |||
| Selling, general and administrative expense | $ 43,000 | $ 72,000 | |
| George M. Marcus [Member] | |||
| Related Party Transaction [Line Items] | |||
| Beneficial ownership percentage | 40.00% | ||
| X | ||||||||||
- Definition The Company's Founder and Co-Chairman beneficial ownership percentage of the Company's issued and outstanding common stock. No definition available.
|
| X | ||||||||||
- Definition For an unclassified balance sheet, amounts due from an Entity employee, not to include stockholders or officers. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. No definition available.
|
| X | ||||||||||
- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party. No definition available.
|
| X | ||||||||||
- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|