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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 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains $ 143 $ 24 $ 419 $ 490
Net income 143 24 419 490
Prior service benefit 109 [1] 92 [1] 217 [1] 183 [1]
Net income 109 [1] 92 [1] 217 [1] 183 [1]
Total reclassifications $ 252 $ 116 $ 636 $ 673
[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."