Marcus & Millichap, Inc. Quarterly report pursuant to Section 13 or 15(d)

Selected Balance Sheet Data - Schedule of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Assets [Line Items]
Other assets	$ 4,143	$ 3,146
Commission notes receivable [Member]
Other Assets [Line Items]
Other assets	40	82
Due from independent contractors [Member]
Other Assets [Line Items]
Other assets	2,799	1,938
Security deposits [Member]
Other Assets [Line Items]
Other assets	1,171	1,126
Other [Member]
Other Assets [Line Items]
Other assets	$ 133