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Pension and Postretirement Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive (Loss)/Income (Parenthetical) (Detail)
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12 Months Ended |
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Dec. 31, 2011
Year
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U.S. Qualified Pension Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Average period actuarial losses are amortized into net periodic pension costs | 9.9 |
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U.S. Supplemental (Non-Qualified) Pension Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Average period actuarial losses are amortized into net periodic pension costs | 9.7 |
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International Pension Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Average period actuarial losses are amortized into net periodic pension costs | 14 |
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Postretirement Plans [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |
| Average period actuarial losses are amortized into net periodic pension costs | 11.1 |