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Related-Party Transactions - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |
Aggregate principal amount outstanding for employee notes receivable | $ 546,000 | $ 546,000 |  | $ 546,000 |  | $ 382,000
MMC [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Accounts payable and other accrued expenses - related party |  |  | $ 661,000 |  | $ 661,000 | $ 96,000
Real estate brokerage commissions and financing fees from transactions with former parent, Marcus & Millichap Company |  | 1,100,000 | 305,000 | 3,500,000 | 1,600,000 |
Commission expenses for transactions with former parent, Marcus & Millichap Company |  | 674,000 | 173,000 | 2,100,000 | 943,000 |
Rent expense for lease |  | $ 253,000 | 219,000 | 759,000 | 474,500 |
Lease expiration date |  | May 31, 2022 |  |  |  |
MMC [Member] | Transition Services Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Selling, general and administrative expense |  | $ 61,000 | $ 56,000 | $ 185,000 | $ 165,000 |
Transition services agreement date |  | Oct. 01, 2013 |  |  |  |
George M. Marcus [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Beneficial ownership percentage | 55.20% |  |  |  |  |

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