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Pension Information - Components of Net Periodic Pension Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]        
Service cost   $ 94   $ 264
Interest cost $ 156 201 $ 468 581
Expected return on plan assets (283) (312) (848) (903)
Other components 70 89 210 222
Net periodic pension cost (benefit) $ (57) $ 72 $ (170) $ 164