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Pension Information - Components of Net Periodic Pension Expense (Benefit) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]    
Service cost $ 0  
Interest cost 170 $ 156
Expected return on plan assets (274) (283)
Other components 83 70
Net periodic pension cost (benefit) $ (21) $ (57)