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Pension Plans and Other Postretirement Benefits - Effects on One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Compensation and Retirement Disclosure [Abstract]  
Service and interest cost $ 108
Accumulated postretirement benefit obligation 3,180
Service and interest cost (96)
Accumulated postretirement benefit obligation $ (2,729)