Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Expected return on plan assets (as a percent)	8.00%
Discretionary contributions towards 401(k) Plan, Maximum (as a percent)	4.00%	3.00%
Discretionary contributions to various defined contribution plans	$ 1,068	$ 932
Contributions to various defined contribution plans	$ 1,713	$ 1,466