Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Description of Business and Basis of Presentation - Additional Information (Detail)
9 Months Ended
Sep. 30, 2019
Office
Class of Stock [Line Items]  
Number of offices in the United States and Canada 82
Formation date 2013-06
Percentage of common stock distributed 80.00%
IPO MMI [Member]  
Class of Stock [Line Items]  
IPO completion date Oct. 30, 2013