Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.8.0.1
Related-Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]          
Aggregate principal amount for employee notes receivable $ 605,000   $ 605,000   $ 446,000
MMC [Member]          
Related Party Transaction [Line Items]          
Real estate brokerage commissions and financing fees from transactions with subsidiaries of Marcus & Millichap Company 309,000 $ 1,100,000 632,000 $ 3,500,000  
Commission expenses for transactions with subsidiaries of Marcus & Millichap Company 181,000 674,000 368,000 2,100,000  
Rent expense for lease 253,000 253,000 $ 759,000 759,000  
Lease expiration date     May 31, 2022    
Accounts payable and other accrued expenses - related party 91,000   $ 91,000   $ 303,000
MMC [Member] | Transition Services Agreement [Member]          
Related Party Transaction [Line Items]          
Selling, general and administrative expense $ 43,000 $ 61,000 $ 168,000 $ 185,000  
Transition services agreement date Oct. 01, 2013        
George M. Marcus [Member]          
Related Party Transaction [Line Items]          
Beneficial ownership percentage 53.00%