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Weighted Average Asset Allocation for Pension Plans and Target Allocation (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 100.00% |
Actual Allocation | 100.00% | 100.00%
Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 58.00% |
Equity Securities | United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 49.00% |
Actual Allocation | 47.00% | 47.00%
Equity Securities | International |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 9.00% |
Actual Allocation | 10.00% | 10.00%
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 42.00% |
Actual Allocation | 42.00% | 42.00%
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 0.00% |
Actual Allocation | 1.00% | 1.00%

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