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. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Amortization of pension and other postretirement benefit plan items:
Tax benefit	$ 5,781	$ (6,225)	$ 96	$ (12,423)
Net of tax	1,145	1,201	2,305	2,374
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			3,799
Prior service credit			(52)
Total before tax			3,747
Tax benefit			(1,442)
Net of tax			$ 2,305