Annual report pursuant to Section 13 and 15(d)

Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail)

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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail)
0 Months Ended 12 Months Ended
Oct. 31, 2013
Dec. 31, 2013
Description Of Business And Basis Of Presentation [Line Items]    
Contribution date   Oct. 30, 2013
Effective date of IPO   Oct. 31, 2013
Percentage of common stock distributed 80.00%  
MMREIS [Member]
   
Description Of Business And Basis Of Presentation [Line Items]    
Formation date   1976
MMI [Member]
   
Description Of Business And Basis Of Presentation [Line Items]    
Formation date   2013-06