Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 455,166	$ 458,907
Pre-tax Activity	$ 259	$ 975	1,814	2,919
Tax Effect	(63)	(241)	(20,167)	(720)
Ending Balance	481,107	468,563	481,107	468,563
Reclassification of Stranded Tax Effects [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(19,720)
Tax Effect			(19,720)
Ending Balance	(19,720)		(19,720)
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Pre-tax Activity	(496)		(496)
Tax Effect	122		122
Ending Balance	(374)		(374)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4)	8		14
Pre-tax Activity	(23)	(2)	(26)	(10)
Tax Effect	6	1	5	3
Ending Balance	(21)	7	(21)	7
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(95,814)	(92,737)	(77,265)	(94,202)
Ending Balance	(95,618)	(92,003)	(95,618)	(92,003)
Net Pension Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(71,332)	(77,212)	(72,690)	(78,618)
Pre-tax Activity	901	934	2,702	2,800
Tax Effect	(222)	(231)	(665)	(691)
Ending Balance	(70,653)	(76,509)	(70,653)	(76,509)
Net Pension Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(15)	(34)	(24)	(43)
Pre-tax Activity	5	6	17	18
Tax Effect	(1)	(2)	(4)	(5)
Ending Balance	(11)	(30)	(11)	(30)
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4,607)	(16,547)	(4,902)	(17,299)
Pre-tax Activity	196	499	587	1,497
Tax Effect	(48)	(123)	(144)	(369)
Ending Balance	(4,459)	(16,171)	(4,459)	(16,171)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(136)	1,048	351	1,744
Pre-tax Activity	(324)	(462)	(970)	(1,386)
Tax Effect	80	114	239	342
Ending Balance	$ (380)	$ 700	$ (380)	$ 700