Employee Benefit Plans (Pension Benefit Plan) - Summary of Net Amounts Recognized Balance Sheet for the Unfunded Pension Liability (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Current liability	$ 0	$ 0
Non-current liability	(9,966)	(7,638)
Total	$ (9,966)	$ (7,638)