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Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure      
Deferred taxes $ (9,808) $ (10,597) $ (12,018)
United States Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Prior service cost, before tax 127 224  
Deferred taxes 514 479  
Total recognized in other comprehensive income, net of tax 641 703  
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Prior service cost, before tax (1,118) (1,632)  
Deferred taxes (1,292) (1,100)  
Total recognized in other comprehensive income, net of tax $ (2,410) $ (2,732)