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Retirement Plans - Defined Benefit Plans - Actuarial Assumptions Used In Defined Benefit Pension Plans (Detail)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Weighted average assumptions used to determine benefit obligations as of December 31: | |||
| Discount rate | 3.83% | 4.75% | 3.80% |
| Weighted average assumptions used to determine net periodic pension cost for the fiscal year: | |||
| Discount rate | 4.75% | 3.84% | 4.30% |
| Expected long-term return on plan assets | 6.50% | 6.50% | 6.50% |