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Pension Plans and Other Postretirement Benefits - Assumed Weighted-Average Rates Used to Determine Net Benefit Expense (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Discount rate 4.25% 4.00%  
Pension Benefits [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Discount rate 4.00% 4.75% 3.75%
Long-term rate of return on plan assets 6.50% 6.50% 6.50%
Rate of increase in future compensation levels 4.39% 4.42% 4.50%
Other Postretirement Benefits [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Discount rate 4.00% 4.75% 3.75%