Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan (Detail)

v3.6.0.2
Employee Benefit Plan (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Employer matching contributions $ 1.5 $ 1.3 $ 1.2