Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (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
Amortization of pension and other postretirement benefit plan items:
Actuarial losses			$ 3,931
Amortization of prior service credit			(71)
Total before tax			3,860
Tax benefit			(1,486)
Pension and other postretirement benefit plans, net of tax	$ 1,201		$ 2,374