Marcus & Millichap, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail)

Stock-Based Compensation Plans - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Vested shares	295,597	258,123
Tax benefit from stock-based award activity included in provision for income taxes	$ 2,900
Tax benefit from stock-based award activity included in additional paid-in capital		$ 2,711	$ 6,173
2013 Omnibus Equity Incentive Plan [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued under compensation plan	0
Number of shares outstanding under compensation plan	0
2013 Omnibus Equity Incentive Plan [Member] \| Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2013 Omnibus Equity Incentive Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Vested shares	279,679	5,158
Number of common stock shares withheld to pay employee statutory withholding taxes	55,289
Vested and delivered shares	284,837
2013 Omnibus Equity Incentive Plan [Member] \| SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued under compensation plan	0
Number of shares outstanding under compensation plan	0
2013 Omnibus Equity Incentive Plan [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued under compensation plan	0
Number of shares outstanding under compensation plan	0
2013 Omnibus Equity Incentive Plan [Member] \| Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued under compensation plan	0
Number of shares outstanding under compensation plan	0
2013 Omnibus Equity Incentive Plan [Member] \| Deferred stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares withheld to pay employee statutory withholding taxes	137,351
Issuance of common stock for settlement of deferred stock units	351,801
Fair value of shares vested	$ 10,200	$ 10,400	18,600
Fully vested deferred stock units remaining outstanding	578,618	930,419
2013 Omnibus Equity Incentive Plan [Member] \| Restricted Stock Units and Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	$ 7,800	$ 7,000	$ 7,500