Employee Benefits - Weighted Average Assumptions Used to Determine Postretirement Benefit Expense and Obligation (Detail)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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Expense [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||
Discount rate | 4.00% | 4.60% |
Current medical cost trend rate | 6.75% | 7.00% |
Ultimate medical cost trend rate | 4.75% | 4.75% |
Medical cost trend rate decreases to ultimate rate in year | 2021 | 2021 |
Liability [Member]
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Defined Benefit Plan Disclosure [Line Items] | ||
Discount rate | 4.80% | 4.00% |
Current medical cost trend rate | 6.50% | 6.75% |
Ultimate medical cost trend rate | 4.75% | 4.75% |
Medical cost trend rate decreases to ultimate rate in year | 2021 | 2021 |