Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Domestic Employees
Employee Benefit Plan [Line Items]
Employer contributions to plan	$ 10.9	$ 9.7	$ 9.2
Foreign Employees
Employee Benefit Plan [Line Items]
Employer contributions to plan	$ 6.1	$ 6.0	$ 5.3