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Components of Net Periodic Pension Cost (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of net periodic pension cost      
Expected return on plan assets     $ (390,000)
Interest cost on projected benefit obligations   $ 0 364,000
Net periodic pension cost $ 0 $ 0 $ (26,000)