Organization - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 Employee Country Customer	Oct. 25, 2012 shares
Organization [Line Items]
Number of professionals around the globe, minimum | Employee	75,000
Number of countries in which entity operates | Country	25
Common stock shares purchased by affiliates of Bain Capital Partners | shares		67,750,678
Minimum | Fortune Global 500
Organization [Line Items]
Number of clients | Customer	100