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Pensions and Other Postretirement Benefits - Additional Information (Detail) (Immaterial correction of an error, USD $)
In Thousands, unless otherwise specified |
9 Months Ended | 12 Months Ended |
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Sep. 30, 2012
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Dec. 31, 2011
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Immaterial correction of an error
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| Correction in amortization period | 10 years | |
| Average remaining life expectancy of plan participants | 26 years | |
| Pre-tax benefit related to the reversal of amortization | $ 2,000 |