Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 01, 2018	Apr. 02, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 458,907	$ 363,024
Pre-tax Activity		980	720
Tax Effect		(241)	(278)
Ending Balance		447,582	360,390
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		14	(11)
Pre-tax Activity		4	4
Tax Effect		(1)	(2)
Ending Balance		17	(9)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(94,202)	(92,897)
Ending Balance		(93,463)	(92,455)
Net Pension Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(78,618)	(72,393)
Pre-tax Activity		933	807
Tax Effect		(230)	(311)
Ending Balance		(77,915)	(71,897)
Net Pension Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(43)	(61)
Pre-tax Activity		6	7
Tax Effect		(2)	(3)
Ending Balance		(39)	(57)
Net Postretirement Benefits Activity [Member] | Deep South and Somerset Exchange Business and the Florence and Laurel Distribution Business [Member] | October 2017 Divestitures [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	6,220
Ending Balance	[1]	6,220
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(23,519)	(24,111)
Pre-tax Activity		499	648
Tax Effect		(122)	(250)
Ending Balance		(23,142)	(23,713)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		1,744	3,679
Pre-tax Activity		(462)	(746)
Tax Effect		114	288
Ending Balance		$ 1,396	$ 3,221

[1] Recognized loss due to the divestiture of the Deep South and Somerset Exchange Business and the Florence and Laurel Distribution Business during the fourth quarter of 2017.