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Pension Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]        
Service cost $ 27 $ 36 $ 54 $ 59
Interest cost 358 341 716 681
Expected return on plan assets (465) (447) (930) (896)
Recognized net actuarial loss 139 5 278 8
Net periodic benefit cost (income) $ 59 $ (65) $ 118 $ (148)