Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.7.0.1
Related-Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]      
Aggregate principal amount outstanding for employee notes receivable $ 467,000   $ 446,000
MMC [Member]      
Related Party Transaction [Line Items]      
Real estate brokerage commissions and financing fees from transactions with subsidiaries of Marcus & Millichap Company 203,000 $ 1,600,000  
Commission expenses for transactions with subsidiaries of Marcus & Millichap Company 122,000 944,000  
Rent expense for lease $ 253,000 253,000  
Lease expiration date May 31, 2022    
Accounts payable and other accrued expenses - related party $ 119,000   $ 303,000
MMC [Member] | Transition Services Agreement [Member]      
Related Party Transaction [Line Items]      
Selling, general and administrative expense $ 82,000 $ 70,000  
Transition services agreement date Oct. 01, 2013    
George M. Marcus [Member]      
Related Party Transaction [Line Items]      
Beneficial ownership percentage 53.00%