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Pension Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Service cost $ 55 $ 27
Interest cost 365 358
Expected return on plan assets (450) (465)
Recognized net actuarial loss 123 139
Net periodic benefit cost $ 93 $ 59