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Employee Benefit Plans - Assumptions Used to Determine Net Periodic Benefit Costs (Detail)
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12 Months Ended | ||
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Dec. 31, 2013
Age
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Dec. 31, 2012
Age
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Dec. 31, 2011
Age
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Supplemental Executive Retirement Benefits [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 3.50% | 4.25% | 5.25% |
| Rate of compensation increase | 3.00% | 3.00% | 3.00% |
| Retirement age | 72 | 72 | 72 |
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Long-Term Health Care Plan [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 3.06% | 4.06% | 4.67% |
| Rate of compensation increase | 4.00% | 4.00% | 4.00% |