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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
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."