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Accumulated Other Comprehensive Loss - Summary of Impact of Accumulated Other Comprehensive Income (Loss) on Income Statement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2015 | Jun. 29, 2014 | Jun. 28, 2015 | Jun. 29, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | $ 682 | $ 616 | $ 1,364 | $ 1,232
Reclassification to income, Tax Effect | 263 | 239 | 527 | 477
Reclassification to income, Net of Tax | 419 | 377 | 837 | 755
Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | 804 | 431 | 1,609 | 862
Reclassification to income, Tax Effect | 310 | 166 | 621 | 333
Reclassification to income, Net of Tax | 494 | 265 | 988 | 529
Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | (122) | 185 | (245) | 370
Reclassification to income, Tax Effect | (47) | 73 | (94) | 144
Reclassification to income, Net of Tax | (75) | 112 | (151) | 226
Cost of Sales [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | 71 | 106 | 143 | 203
Cost of Sales [Member] | Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | 88 | 82 | 177 | 155
Cost of Sales [Member] | Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | (17) | 24 | (34) | 48
S,D&A Expenses [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | 611 | 510 | 1,221 | 1,029
S,D&A Expenses [Member] | Pension Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | 716 | 349 | 1,432 | 707
S,D&A Expenses [Member] | Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Reclassification to income, Pre-tax Activity | $ (105) | $ 161 | $ (211) | $ 322

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