Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	$ (82,094)	$ (89,500)	$ (82,407)	$ (89,914)
Pre-tax Activity	487	683	997	1,358
Tax Effect	(188)	(264)	(385)	(525)
Ending, balance	(81,795)	(89,081)	(81,795)	(89,081)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	5	(5)	(5)	(1)
Pre-tax Activity	(8)	1	7	(6)
Tax Effect	2	(1)	(3)	2
Ending, balance	(1)	(5)	(1)	(5)
Net Pension Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(67,788)	(74,378)	(68,243)	(74,867)
Pre-tax Activity	740	795	1,481	1,591
Tax Effect	(285)	(307)	(571)	(614)
Ending, balance	(67,333)	(73,890)	(67,333)	(73,890)
Net Pension Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(74)	(94)	(78)	(99)
Pre-tax Activity	7	9	14	18
Tax Effect	(2)	(3)	(5)	(7)
Ending, balance	(69)	(88)	(69)	(88)
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(19,465)	(22,319)	(19,825)	(22,759)
Pre-tax Activity	588	718	1,175	1,435
Tax Effect	(227)	(277)	(454)	(554)
Ending, balance	(19,104)	(21,878)	(19,104)	(21,878)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	5,228	7,296	5,744	7,812
Pre-tax Activity	(840)	(840)	(1,680)	(1,680)
Tax Effect	324	324	648	648
Ending, balance	$ 4,712	$ 6,780	$ 4,712	$ 6,780