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Retirement Plans - Defined Benefit Plans - Detail of Prior Service Cost and Net Actuarial Loss Recognized In Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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| Amounts recognized in Accumulated other comprehensive loss: | ||
| Prior service cost | $ 756 | $ 1,923 |
| Net actuarial loss | $ 26,361 | $ 9,512 |