Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail)

v2.4.1.9
Selected Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Oct. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Financial Statement Data:                          
Total revenues   $ 172,444us-gaap_Revenues $ 150,889us-gaap_Revenues $ 134,265us-gaap_Revenues $ 114,590us-gaap_Revenues $ 149,101us-gaap_Revenues $ 111,953us-gaap_Revenues $ 105,471us-gaap_Revenues $ 69,370us-gaap_Revenues   $ 572,188us-gaap_Revenues $ 435,895us-gaap_Revenues $ 385,716us-gaap_Revenues
Cost of services   109,836us-gaap_CostOfServices 92,269us-gaap_CostOfServices 79,601us-gaap_CostOfServices 68,396us-gaap_CostOfServices 94,242us-gaap_CostOfServices 67,718us-gaap_CostOfServices 61,456us-gaap_CostOfServices 41,221us-gaap_CostOfServices   350,102us-gaap_CostOfServices 264,637us-gaap_CostOfServices 230,248us-gaap_CostOfServices
Operating income (loss)   27,097us-gaap_OperatingIncomeLoss 23,721us-gaap_OperatingIncomeLoss 21,726us-gaap_OperatingIncomeLoss 12,062us-gaap_OperatingIncomeLoss (8,165)us-gaap_OperatingIncomeLoss 12,625us-gaap_OperatingIncomeLoss 14,169us-gaap_OperatingIncomeLoss 2,657us-gaap_OperatingIncomeLoss   84,606us-gaap_OperatingIncomeLoss 21,286us-gaap_OperatingIncomeLoss 49,008us-gaap_OperatingIncomeLoss
Net income (loss)   16,430us-gaap_NetIncomeLoss 13,523us-gaap_NetIncomeLoss 12,796us-gaap_NetIncomeLoss 6,782us-gaap_NetIncomeLoss (8,716)us-gaap_NetIncomeLoss 7,275us-gaap_NetIncomeLoss 8,009us-gaap_NetIncomeLoss 1,638us-gaap_NetIncomeLoss   49,531us-gaap_NetIncomeLoss 8,206us-gaap_NetIncomeLoss 27,934us-gaap_NetIncomeLoss
Net (loss) income (attributable to MMREIS prior to IPO on October 31, 2013)           (17,967)mmi_NetIncomeLossPriorToInitialPublicOffering 7,275mmi_NetIncomeLossPriorToInitialPublicOffering 8,009mmi_NetIncomeLossPriorToInitialPublicOffering 1,638mmi_NetIncomeLossPriorToInitialPublicOffering (1,045)mmi_NetIncomeLossPriorToInitialPublicOffering   (1,045)mmi_NetIncomeLossPriorToInitialPublicOffering 27,934mmi_NetIncomeLossPriorToInitialPublicOffering
Net income attributable to Marcus & Millichap, Inc. subsequent to IPO on October 31, 2013 $ 9,251mmi_NetIncomeLossSubsequentToInitialPublicOffering $ 16,430mmi_NetIncomeLossSubsequentToInitialPublicOffering $ 13,523mmi_NetIncomeLossSubsequentToInitialPublicOffering $ 12,796mmi_NetIncomeLossSubsequentToInitialPublicOffering $ 6,782mmi_NetIncomeLossSubsequentToInitialPublicOffering $ 9,251mmi_NetIncomeLossSubsequentToInitialPublicOffering         $ 49,531mmi_NetIncomeLossSubsequentToInitialPublicOffering $ 9,251mmi_NetIncomeLossSubsequentToInitialPublicOffering  
Earnings per share:                          
Basic $ 0.24us-gaap_EarningsPerShareBasic $ 0.42us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.33us-gaap_EarningsPerShareBasic $ 0.17us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic         $ 1.27us-gaap_EarningsPerShareBasic [1] $ 0.24us-gaap_EarningsPerShareBasic [1]  
Diluted $ 0.24us-gaap_EarningsPerShareDiluted $ 0.42us-gaap_EarningsPerShareDiluted $ 0.35us-gaap_EarningsPerShareDiluted $ 0.33us-gaap_EarningsPerShareDiluted $ 0.17us-gaap_EarningsPerShareDiluted $ 0.24us-gaap_EarningsPerShareDiluted         $ 1.27us-gaap_EarningsPerShareDiluted [1] $ 0.24us-gaap_EarningsPerShareDiluted [1]  
[1] Earnings per share (EPS) for the twelve months ended December 31, 2013 represents EPS attributable to Marcus & Millichap, Inc. subsequent to its initial public offering on October 31, 2013. EPS information for periods prior to the initial public offering were not meaningful.