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Pension Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 55 $ 27 $ 110 $ 54
Interest cost 364 358 729 716
Expected return on plan assets (449) (465) (899) (930)
Recognized net actuarial loss 123 139 246 278
Net periodic benefit cost $ 93 $ 59 $ 186 $ 118