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Pensions and Other Postemployment Benefits - Additional Information (Details) (Other Postemployment Benefits, USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Other Postemployment Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||||
| Recognized reduction in operating expenses due to curtailment | $ 0 | $ 116,000 | $ 0 | $ 116,000 |
| Reduction in liability due to curtailment | $ 4,400,000 | |||