Annual report pursuant to Section 13 and 15(d)

Description of Business and Basis of Presentation - Additional Information (Detail)

v3.3.1.900
Description of Business and Basis of Presentation - Additional Information (Detail)
 12 Months Ended
Nov. 05, 2013
$ / shares
shares
Dec. 31, 2015
Office
Nov. 30, 2013
$ / shares
Class of Stock [Line Items]      
Number of offices in the United States and Canada | Office   79  
Formation date   2013-06  
Contribution date   Oct. 30, 2013  
Percentage of common stock distributed   80.00%  
IPO [Member]      
Class of Stock [Line Items]      
Common stock sold during initial public offering 6,900,000    
Common stock sold and issued under IPO, price per share | $ / shares $ 12.00   $ 12.00
Description of IPO   On November 5, 2013, MMI completed its Initial Public Offering ("IPO") of 6,900,000 shares of common stock at a price to the public of $12.00 per share of which 4,173,413 shares were sold by the Company and 2,726,587 shares were sold by certain selling stockholders.  
IPO MMI [Member]      
Class of Stock [Line Items]      
Common stock sold during initial public offering 4,173,413    
IPO Selling Stockholder [Member]      
Class of Stock [Line Items]      
Common stock sold during initial public offering 2,726,587