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Schedule of Plan Assets Category (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation | 100.00% | 100.00%
Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation | 23.00% | 21.00%
Fixed Income Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation | 75.00% | 76.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset Allocation | 2.00% | 3.00%

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