Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Amortization of pension and other postretirement benefit plan items:
Net of tax	$ 515	$ 843	$ 982	$ 1,691
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			1,638
Prior service credit			(40)
Total before tax			1,598
Tax benefit			(616)
Net of tax			$ 982