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Schedule of Weighted Average Pension Assets Allocations by Category (Detail) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
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 | 88.10% | 88.10%
United States Pension Plans, Defined Benefit | Equity securities |  |
Defined Benefit Plan Disclosure |  |
Total | 9.90% | 9.90%
United States Pension Plans, Defined Benefit | Other than Securities Investment |  |
Defined Benefit Plan Disclosure |  |
Total | 2.00% | 2.00%
Foreign Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure |  |
Total | 100.00% | 100.00%
Foreign Pension Plans, Defined Benefit | Other than Securities Investment |  |
Defined Benefit Plan Disclosure |  |
Total | 100.00% | 100.00%

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