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Postretirement Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Apr. 23, 2016 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015 | Dec. 31, 2015
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Settlement loss | $ (173,000) | $ (1,832,000) | $ (4,641,000) | $ 0 | $ (6,646,000) |  | $ (15,387,000) |
Expected pension income for fiscal 2017 |  |  |  |  | $ 5,000,000 |  |  |
Expected long-term rate of return on plan assets |  |  |  |  | 8.00% |  |  |
Percentage of total plan assets | 100.00% |  |  |  | 100.00% | 100.00% |  |
Expected company contribution |  |  |  |  | $ 692,000 |  |  |
Postretirement Benefits, minimum years of service for eligibility |  |  |  |  | 10 years |  |  |
Postretirement Benefits, minimum age for eligibility |  |  |  |  | 55 years |  |  |
Expense under plans |  |  |  |  | $ 2,238,000 | $ (5,878,000) | $ 5,341,000 |
Multiemployer plans, minimum contribution | $ 0 |  |  |  | $ 0 |  |  |
Minimum |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Retiree medical coverage provided |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Retiree medical coverage provided |  |  |  |  | 5 years |  |  |
Contribution of pension fund in excess of total contribution |  |  |  |  | 5.00% | 5.00% | 5.00% |
Common Stock |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Defined benefit plan equity securities included in common stock | 2,030,363 |  |  |  | 2,030,363 |  |  | 2,030,363
Equity securities, amount | $ 40,500,000 |  |  |  | $ 40,500,000 |  |  | $ 43,600,000
Percentage of total plan assets | 12.10% |  |  |  | 12.10% |  |  | 11.80%
Equity Securities |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Targeted equities |  |  |  |  | 65.00% |  |  |
Percentage of total plan assets | 51.10% |  |  |  | 51.10% | 55.60% |  |
Pension plans |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Settlement loss |  |  |  |  | $ (6,646,000) |  | $ (15,387,000) |
Actual return on plan assets |  |  |  |  | 4,689,000 | $ 6,881,000 | $ 11,600,000 |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) |  |  |  |  | $ 6,800,000 |  |  |
Expected long-term rate of return on plan assets |  |  |  |  | 8.00% | 8.00% | 8.00% |
Contribution of company to company pension plans |  |  |  |  | $ 1,341,000 | $ 10,436,000 | $ 13,435,000 |
Pension plans | Required |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  | 341,000 | 436,000 | 5,070,000 |
Pension plans | Discretionary |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  | $ 1,000,000 | 10,000,000 | 8,365,000 |
Last Fifteen Years |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Average annual return on the plan assets |  |  |  |  | 6.90% |  |  |
Inception in 1987 |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Average annual return on the plan assets |  |  |  |  | 8.90% |  |  |
Last Five Years |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Average annual return on the plan assets |  |  |  |  | 8.50% |  |  |
Non Qualified Pension Plans |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected company contribution |  |  |  |  | $ 300,000 |  |  |
Non Qualified Pension Plans | Required |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  | 300,000 |  |
Qualified Pension Plans |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected company contribution |  |  |  |  | 0 |  |  |
Qualified Pension Plans | Discretionary |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  | 1,000,000 |  |
Postretirement Benefit Plans |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) |  |  |  |  | (700,000) |  |  |
Contribution of company to company pension plans |  |  |  |  | 841,000 | 674,000 |  |
Expected company contribution |  |  |  |  | 692,000 |  |  |
Contributions by participants |  |  |  |  | 284,000 | 224,000 | 200,000 |
Multiemployer Plans |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Expense under plans |  |  |  |  | $ 2,200,000 | $ 2,100,000 | $ 2,100,000 |
Red Zone |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  | Less than 65 percent |  |  |
Yellow Zone |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  | Between 65 and less than 80 percent |  |  |
Green Zone |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  | At least 80 percent |  |  |

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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