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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jul. 01, 2012 | Jun. 30, 2013 | Jul. 01, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | $ 1,164 | $ 932 | $ 2,328 | $ 1,864
Income tax expense | 456 | 366 | 913 | 733
Total after tax effect | 708 | 566 | 1,415 | 1,131
Cost of Sales [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 118 | 105 | 229 | 210
S,D&A Expenses [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 1,046 | 827 | 2,099 | 1,654
Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 842 | 699 | 1,684 | 1,397
Income tax expense | 330 | 275 | 660 | 550
Total after tax effect | 512 | 424 | 1,024 | 847
Pension Plans [Member] | Cost of Sales [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 76 | 77 | 152 | 154
Pension Plans [Member] | S,D&A Expenses [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 766 | 622 | 1,532 | 1,243
Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 322 | 233 | 644 | 467
Income tax expense | 126 | 91 | 253 | 183
Total after tax effect | 196 | 142 | 391 | 284
Postretirement Benefits [Member] | Cost of Sales [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | 42 | 28 | 77 | 56
Postretirement Benefits [Member] | S,D&A Expenses [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Subtotal pre-tax | $ 280 | $ 205 | $ 567 | $ 411

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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