Reclassification From Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013
Schedule of Pension and Other Postretirement Benefits Recognized in Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of actuarial loss and prior service costs-total before tax	$ (274)	[1],[2]
Tax benefit	102	[2]
Net of tax	$ (172)	[2]

[1] The amount is included in the computation of net periodic pension cost.

[2] Amounts in parenthesis indicate reductions to net income upon reclassification from accumulated other comprehensive loss.