Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 455,166	$ 458,907
Pre-tax Activity	$ 787	$ 964	1,555	1,944
Tax Effect	(194)	(238)	(20,104)	(479)
Ending Balance	467,709	443,222	467,709	443,222
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)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(9)	17		14
Pre-tax Activity	7	(12)	(3)	(8)
Tax Effect	(2)	3	(1)	2
Ending Balance	(4)	8	(4)	8
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(96,407)	(93,463)	(77,265)	(94,202)
Ending Balance	(95,814)	(92,737)	(95,814)	(92,737)
Net Pension Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(72,011)	(77,915)	(72,690)	(78,618)
Pre-tax Activity	900	933	1,801	1,866
Tax Effect	(221)	(230)	(443)	(460)
Ending Balance	(71,332)	(77,212)	(71,332)	(77,212)
Net Pension Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(20)	(39)	(24)	(43)
Pre-tax Activity	7	6	12	12
Tax Effect	(2)	(1)	(3)	(3)
Ending Balance	(15)	(34)	(15)	(34)
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4,754)	(16,922)	(4,902)	(17,299)
Pre-tax Activity	195	499	391	998
Tax Effect	(48)	(124)	(96)	(246)
Ending Balance	(4,607)	(16,547)	(4,607)	(16,547)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	107	1,396	351	1,744
Pre-tax Activity	(322)	(462)	(646)	(924)
Tax Effect	79	114	159	228
Ending Balance	$ (136)	$ 1,048	$ (136)	$ 1,048