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Reclassifcation Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Apr. 01, 2012
Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Unrealized gains | $ 275 |  | $ 466 |
Net income | 275 |  | 466 |
Prior service benefit | 109 | [1] | 92 | [1]
Net income | 109 | [1] | 92 | [1]
Total Reclassifications | $ 384 |  | $ 558 |
[1] | The amortization of prior service benefit is included in the computation of net periodic pension and postretirement benefit costs; see Note M "Retirement Plans."

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