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

Selected Balance Sheet Data - Schedule of Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Assets [Line Items]
Other assets Current	$ 2,839us-gaap_OtherAssetsCurrent	$ 2,429us-gaap_OtherAssetsCurrent
Other assets Non-Current	3,282us-gaap_OtherAssetsNoncurrent	2,478us-gaap_OtherAssetsNoncurrent
Due from independent contractors [Member]
Other Assets [Line Items]
Other assets Current	1,577	1,249
Other assets Non-Current	1,820	1,280
Security deposits [Member]
Other Assets [Line Items]
Other assets Non-Current	1,240	1,126
Customer trust accounts and other [Member]
Other Assets [Line Items]
Other assets Current	1,262	1,180
Other assets Non-Current	$ 222	$ 72