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Employee Benefits Plans (Detail) - Components of other postretirement benefit cost: (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Interest cost	$ 25	$ 33
Amortization of prior service benefit	(41)	(45)
Amortization of accumulated loss	8	7
Net periodic postretirement benefit income	$ (8)	$ (5)

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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