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Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure      
Deferred taxes $ (10,597) $ (12,018) $ (12,192)
United States Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Prior service cost, before tax 224 358  
Deferred taxes 479 429  
Total recognized in other comprehensive income, net of tax 703 787  
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Prior service cost, before tax (1,632) (2,230)  
Deferred taxes (1,100) (882)  
Total recognized in other comprehensive income, net of tax $ (2,732) $ (3,112)