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Reclassification Out of Accumulated Other Comprehensive Income to Statement of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2013 | Sep. 30, 2012 | Sep. 29, 2013 | Sep. 30, 2012
Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Unrealized gains | $ 202 |  | $ 93 |  | $ 621 |  | $ 583 |
Net income | 202 |  | 93 |  | 621 |  | 583 |
Prior service benefit | 109 | [1] | 92 | [1] | 325 | [1] | 275 | [1]
Net income | 109 |  | 92 |  | 325 |  | 275 |
Total reclassifications | $ 311 |  | $ 185 |  | $ 946 |  | $ 858 |
[1] | The amortization of prior service benefit is included in the computation of net periodic pension cost and postretirement benefit; see Note M "Retirement Plans."

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