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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Amortization of pension and other postretirement benefit plan items:    
Total net of tax $ 6,336 $ 3,430
Settlement loss [Member]    
Amortization of pension and other postretirement benefit plan items:    
Total before tax 7,630  
Actuarial losses [Member]    
Amortization of pension and other postretirement benefit plan items:    
Total before tax 2,756  
Prior service credit [Member]    
Amortization of pension and other postretirement benefit plan items:    
Total before tax (84)  
Pension and Other Postretirement Benefit Plans [Member]    
Amortization of pension and other postretirement benefit plan items:    
Total before tax 10,302  
Tax benefit (3,966)  
Total net of tax $ 6,336 $ 3,430