Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	$ (81,795)	$ (89,081)	$ (82,407)	$ (89,914)
Pre-tax Activity	499	681	1,496	2,039
Tax Effect	(192)	(259)	(577)	(784)
Ending, balance	(81,488)	(88,659)	(81,488)	(88,659)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(1)	(5)	(5)	(1)
Pre-tax Activity	4		11	(6)
Tax Effect	(1)	1	(4)	3
Ending, balance	2	(4)	2	(4)
Net Pension Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(67,333)	(73,890)	(68,243)	(74,867)
Pre-tax Activity	741	795	2,222	2,386
Tax Effect	(286)	(305)	(857)	(919)
Ending, balance	(66,878)	(73,400)	(66,878)	(73,400)
Net Pension Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(69)	(88)	(78)	(99)
Pre-tax Activity	7	9	21	27
Tax Effect	(3)	(2)	(8)	(9)
Ending, balance	(65)	(81)	(65)	(81)
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	(19,104)	(21,878)	(19,825)	(22,759)
Pre-tax Activity	587	717	1,762	2,152
Tax Effect	(226)	(275)	(680)	(829)
Ending, balance	(18,743)	(21,436)	(18,743)	(21,436)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning, balance	4,712	6,780	5,744	7,812
Pre-tax Activity	(840)	(840)	(2,520)	(2,520)
Tax Effect	324	322	972	970
Ending, balance	$ 4,196	$ 6,262	$ 4,196	$ 6,262