Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.3.0.814
Related-Party Transactions - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 18, 2015
Mar. 13, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]                
Accounts payable and other accrued expenses - related party     $ 92,000   $ 92,000     $ 97,000
Transition services agreement date         Oct. 01, 2013      
Real estate brokerage commissions and financing fees from transactions with former parent, Marcus & Millichap Company     305,000 $ 872,000 $ 1,600,000 $ 932,000    
Commission expenses for transactions with former parent, Marcus & Millichap Company     173,000 540,000 943,000 576,000    
Aggregate principal amount outstanding for employee notes receivable     366,000   366,000     378,000
MMC [Member]                
Related Party Transaction [Line Items]                
Rent expense for lease     219,000 109,000 $ 474,500 328,000    
Lease expiration date         May 31, 2022      
MMC [Member] | Transition Services Agreement [Member]                
Related Party Transaction [Line Items]                
Selling, general and administrative expense     56,000 $ 42,000 $ 165,000 1,200,000    
Accounts payable and other accrued expenses - related party     $ 92,000   92,000     $ 97,000
MMC [Member] | Transition Services Agreement [Member] | Health Insurance Premium [Member]                
Related Party Transaction [Line Items]                
Selling, general and administrative expense         $ 0 $ 1,000,000    
Health insurance plan establishment date         2014-04      
George M. Marcus [Member]                
Related Party Transaction [Line Items]                
Beneficial indirect ownership percentage         53.20%      
Shares registered for future sale     4,600,000   4,600,000      
Registration Statement date         Feb. 06, 2015      
Proceeds from issuance of common stock         $ 0      
New shares offered         0      
Costs incurred in connection with registration statement, reimbursed by selling stockholders             $ 113,000  
Sale date of shares filed under registration statement         Mar. 18, 2015      
Prospectus Supplement filing date         Mar. 13, 2015      
George M. Marcus [Member] | Underwriters [Member]                
Related Party Transaction [Line Items]                
Common stock sold by certain selling stockholders 600,000 600,000            
Common stock selling price $ 31.9925              
George M. Marcus [Member] | Selling Stockholders [Member]                
Related Party Transaction [Line Items]                
Common stock sold by certain selling stockholders 4,000,000 4,000,000            
Common stock selling price $ 31.9925