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Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 01, 2017 | Oct. 02, 2016 | Oct. 01, 2017 | Oct. 02, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 363,024 | $ 322,432
Pre-tax Activity | $ 728 | $ 499 | 2,186 | 1,496
Tax Effect | (281) | (192) | (843) | (577)
Ending Balance | 383,116 | 353,941 | 383,116 | 353,941
Foreign Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 5 | (1) | (11) | (5)
Pre-tax Activity | 11 | 4 | 37 | 11
Tax Effect | (4) | (1) | (14) | (4)
Ending Balance | 12 | 2 | 12 | 2
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (92,001) | (81,795) | (92,897) | (82,407)
Ending Balance | (91,554) | (81,488) | (91,554) | (81,488)
Net Pension Activity [Member] | Actuarial Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (71,402) | (67,333) | (72,393) | (68,243)
Pre-tax Activity | 807 | 741 | 2,421 | 2,222
Tax Effect | (311) | (286) | (934) | (857)
Ending Balance | (70,906) | (66,878) | (70,906) | (66,878)
Net Pension Activity [Member] | Prior Service Costs [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (52) | (69) | (61) | (78)
Pre-tax Activity | 7 | 7 | 21 | 21
Tax Effect | (3) | (3) | (8) | (8)
Ending Balance | (48) | (65) | (48) | (65)
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (23,315) | (19,104) | (24,111) | (19,825)
Pre-tax Activity | 648 | 587 | 1,944 | 1,762
Tax Effect | (250) | (226) | (750) | (680)
Ending Balance | (22,917) | (18,743) | (22,917) | (18,743)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 2,763 | 4,712 | 3,679 | 5,744
Pre-tax Activity | (745) | (840) | (2,237) | (2,520)
Tax Effect | 287 | 324 | 863 | 972
Ending Balance | $ 2,305 | $ 4,196 | $ 2,305 | $ 4,196

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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