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Pension Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]      
Service cost $ 189 $ 118 $ 222
Interest cost 1,436 1,362 1,251
Expected return on plan assets (1,849) (1,792) (1,436)
Recognized net actuarial loss 583 16 493
Net periodic pension cost (income) $ 359 $ (296) $ 530