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Related-Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Operating lease cost | $ 6,148,000 |  | $ 18,163,000 |  |
Aggregate principal amount for employee notes receivable | 523,000 |  | 523,000 |  | $ 526,000
MMC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Real estate brokerage commissions and financing fees from transactions with subsidiaries of Marcus & Millichap Company | 1,200,000 | $ 1,800,000 | 4,000,000.0 | $ 4,900,000 |
Commission expenses for transactions with subsidiaries of Marcus & Millichap Company | 688,000 | 1,100,000 | 2,300,000 | 2,900,000 |
Operating lease cost | 333,000 | 257,000 | $ 999,000 | 765,000 |
Lease expiration date |  |  | May 31, 2022 |  |
Accounts payable and other liabilities - related party | 93,000 |  | $ 93,000 |  | $ 101,000
MMC [Member] | Transition Services Agreement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Selling, general and administrative expense | $ 21,000 | $ 20,000 | $ 96,000 | $ 147,000 |
George M. Marcus [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Beneficial ownership percentage |  |  | 40.00% |  |

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