Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Selected Quarterly Financial Data - Schedule of Quarterly Financial Data (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Income Statement [Abstract]    
Stock-based and other compensation in connection with IPO $ 31,300mmi_StockbasedAndOtherCompensationInConnectionWithInitialPublicOffering $ 31,268mmi_StockbasedAndOtherCompensationInConnectionWithInitialPublicOffering