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Schedule of Weighted Average Pension Assets Allocations by Category (Detail)
Dec. 31, 2015
Dec. 31, 2014
United States Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure    
Total 100.00% 100.00%
United States Pension Plans, Defined Benefit | Fixed income securities    
Defined Benefit Plan Disclosure    
Total 88.60% 83.30%
United States Pension Plans, Defined Benefit | Equity securities    
Defined Benefit Plan Disclosure    
Total 9.80% 15.40%
United States Pension Plans, Defined Benefit | Other than Securities Investment    
Defined Benefit Plan Disclosure    
Total 1.60% 1.30%
Foreign Pension Plans, Defined Benefit    
Defined Benefit Plan Disclosure    
Total 100.00% 100.00%
Foreign Pension Plans, Defined Benefit | Fixed income securities    
Defined Benefit Plan Disclosure    
Total   77.30%
Foreign Pension Plans, Defined Benefit | Equity securities    
Defined Benefit Plan Disclosure    
Total   19.00%
Foreign Pension Plans, Defined Benefit | Other than Securities Investment    
Defined Benefit Plan Disclosure    
Total 100.00% 3.70%