Annual report pursuant to Section 13 and 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.6.0.2
Related-Party Transactions - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 18, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 06, 2015
Related Party Transaction [Line Items]          
Rent expense for lease   $ 23,400,000 $ 17,800,000 $ 16,700,000  
Aggregate principal amount outstanding for employee notes receivable   446,000 382,000    
MMC [Member]          
Related Party Transaction [Line Items]          
Real estate brokerage commissions and financing fees from transactions with subsidiaries of Marcus & Millichap Company   5,100,000 2,700,000 1,300,000  
Commission expenses for transactions with subsidiaries of Marcus & Millichap Company   3,000,000 1,600,000 816,000  
Rent expense for lease   $ 1,000,000 693,500 438,000  
Lease expiration date   May 31, 2022      
Accounts payable and other accrued expenses - related party   $ 303,000 96,000    
MMC [Member] | Transition Services Agreement [Member]          
Related Party Transaction [Line Items]          
Selling, general and administrative expense   $ 227,000.0 $ 257,000.0 1,300,000  
Transition services agreement date   Oct. 01, 2013      
MMC [Member] | Transition Services Agreement [Member] | Health Insurance Premium [Member]          
Related Party Transaction [Line Items]          
Selling, general and administrative expense       $ 1,000,000  
Health insurance plan establishment date   2014-04      
George M. Marcus [Member]          
Related Party Transaction [Line Items]          
Beneficial ownership percentage   55.00%      
Shares registered for future sale         4,600,000
Registration Statement date   Feb. 06, 2015      
Costs incurred in connection with registration statement, reimbursed by selling stockholders $ 113,000        
Sale date of shares filed under registration statement   Mar. 18, 2015      
George M. Marcus [Member] | Secondary Offering [Member]          
Related Party Transaction [Line Items]          
Common stock sold by certain selling stockholders 4,000,000        
Common stock selling price $ 31.9925        
George M. Marcus [Member] | Underwriters [Member]          
Related Party Transaction [Line Items]          
Common stock sold by certain selling stockholders 600,000        
Common stock selling price $ 31.9925