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Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Unrealized gains | $ 447 |  | $ 702 |  | $ 1,412 |
Net income | 447 |  | 702 |  | 1,412 |
Prior service benefit | 276 | [1] | 233 | [1] | (14) | [1]
Net income | 276 |  | 233 |  | (14) |
Total reclassifications | $ 723 |  | $ 935 |  | $ 1,398 |
[1] | The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note N: "Retirement Plans."

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