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Pension and Other Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information (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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Dec. 31, 2011
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Pension Plans, Defined Benefit [Member]
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| Net periodic benefit cost | |||
| Discount rate | 3.90% | 4.70% | 5.20% |
| Expected rate of return on plan assets | 7.50% | 7.50% | 7.50% |
| Salary growth rate | 4.20% | 4.00% | 4.20% |
| Benefit obligation | |||
| Discount rate | 4.50% | 3.90% | 4.70% |
| Salary growth rate | 4.00% | 4.20% | 4.00% |
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U.S. Pension and Other Postretirement Benefit Plan [Member]
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| Net periodic benefit cost | |||
| Discount rate | 4.10% | 4.80% | 5.40% |
| Expected rate of return on plan assets | 8.50% | 8.70% | 8.70% |
| Salary growth rate | 4.50% | 4.50% | 4.50% |
| Benefit obligation | |||
| Discount rate | 5.10% | 4.10% | 4.80% |
| Salary growth rate | 4.50% | 4.50% | 4.50% |