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		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Amortization of pension and other postretirement benefit plan items:
Tax benefit	$ (2,667)	$ (5,700)	$ (2,571)	$ (18,123)
Net of tax	1,111	1,172	3,416	3,546
Pension and Other Postretirement Benefit Plans [Member] | Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]
Amortization of pension and other postretirement benefit plan items:
Actuarial losses			5,589
Prior service credit			(34)
Total before tax			5,555
Tax benefit			(2,139)
Net of tax			$ 3,416