Accumulated Other Comprehensive Loss - Summary of Impact of Accumulated Other Comprehensive Income (Loss) on Income Statement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	$ 682	$ 616
Reclassification to income, Tax Effect	264	238
Reclassification to income, Net of Tax	418	378
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	805	431
Reclassification to income, Tax Effect	311	167
Reclassification to income, Net of Tax	494	264
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	(123)	185
Reclassification to income, Tax Effect	(47)	71
Reclassification to income, Net of Tax	(76)	114
Cost of Sales [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	65	102
Cost of Sales [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	81	78
Cost of Sales [Member] | Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	(16)	24
S,D&A Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	617	514
S,D&A Expenses [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	724	353
S,D&A Expenses [Member] | Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Reclassification to income, Pre-tax Activity	$ (107)	$ 161