Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Narrative (Detail)

v3.22.2.2
Related-Party Transactions - Narrative (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]          
Aggregate principal amount for employee notes receivable $ 1   $ 1   $ 40
MMC          
Related Party Transaction [Line Items]          
Real estate brokerage commissions and financing fees from transactions with subsidiaries of Marcus & Millichap Company 650 $ 603 3,200 $ 1,400  
Commission expenses for transactions with subsidiaries of Marcus & Millichap Company 388 363 1,900 840  
Operating lease cost 296 333 967 998  
Accounts payable and other liabilities - related party 90   90   $ 93
MMC | Transition Services Agreement          
Related Party Transaction [Line Items]          
Selling, general and administrative expense $ (17) $ (11) $ (35) $ 4  
Chairman And Founder          
Related Party Transaction [Line Items]          
Beneficial ownership percentage     38.00%