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
	Mar. 30, 2014	Mar. 31, 2013
Amortization of pension and other postretirement benefit plan items:
Tax benefit	$ (5,685)	$ (6,198)
Net income	24,594	22,245
Pension and Other Postretirement Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Amortization of pension and other postretirement benefit plan items:
Actuarial losses	1,912
Prior service credit	(26)
Total before tax	1,886
Tax benefit	(726)
Net income	$ 1,160