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Postretirement Plans - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Oct. 06, 2018 | Jul. 14, 2018 | Oct. 07, 2017 | Apr. 21, 2018 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plans estimated final non-cash settlement charge |  |  |  |  |  |  |  | $ 125,000,000 |  |  |
Expected pension cost for fiscal 2019 |  |  |  |  |  |  |  | 3,000,000 |  |  |
Expected long-term rate of return on plan assets | 5.20% | 5.90% | 5.90% |  |  |  |  |  |  |  |
Expected company contribution |  |  |  |  |  |  |  | $ 1,041,000 |  |  |
Postretirement Benefits, minimum years of service for eligibility |  |  |  |  |  |  |  | 10 years |  |  |
Postretirement Benefits, minimum age for eligibility |  |  |  |  |  |  |  | 55 years |  |  |
Expense under plans |  |  |  |  |  |  |  | $ 8,474,000 | $ (897,000) | $ 2,238,000 |
Contribution of pension fund in excess of total contribution |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% |
Multiemployer plans, minimum contribution |  |  |  |  |  |  |  | $ 0 |  |  |
Multiemployer plan, withdrawal obligation |  |  |  |  |  | $ 15,200,000 |  |  | $ 15,223,000 |  |
Multiemployer plans transition payments payable |  |  |  |  |  |  |  | $ 3,100,000 |  |  |
Multiemployer plans payable date |  |  |  |  |  |  |  | Nov. 03, 2017 |  |  |
Multiemployer plan withdrawal liability of net present value monthly payments period |  |  |  |  |  | 20 years |  |  |  |  |
Multiemployer plans, increase in withdrawal obligation |  |  |  |  |  |  | $ 2,300,000 |  |  |  |
Multiemployer plan, withdrawal obligation paid |  |  |  |  |  |  | 200,000 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan equity securities included in common stock |  |  |  |  |  |  |  |  |  |  | 2,030,363
Equity securities, amount |  |  |  |  |  |  |  |  |  |  | $ 39,200,000
Percentage of total plan assets |  |  |  |  |  |  |  |  |  |  | 11.50%
Proceeds from sale of equity securities |  |  |  |  |  |  |  | $ 41,000,000 |  |  |
Pension plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  |  |  |  |  | (32,238,000) | (53,098,000) |  |
Actual return on plan assets |  |  |  |  |  |  |  | 2,437,000 | $ 42,076,000 | $ 4,700,000 |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) |  |  |  |  |  |  |  | $ 7,500,000 |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  | 5.34% | 8.00% | 8.00% |
Contribution of company to company pension plans |  |  |  |  |  |  |  | $ 40,971,000 | $ 1,891,000 | $ 1,341,000 |
Last Fifteen Years |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average annual return on the plan assets |  |  |  |  |  |  |  | 6.90% |  |  |
Non Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected company contribution |  |  |  |  |  |  |  | $ 300,000 |  |  |
Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected company contribution |  |  |  |  |  |  |  | 2,500,000 |  |  |
Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  |  |  |  |  | (8,194,000) | (7,943,000) |  |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) |  |  |  |  |  |  |  | (300,000) |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 1,308,000 | 376,000 |  |
Expected company contribution |  |  |  |  |  |  |  | 1,000,000 |  |  |
Contributions by participants |  |  |  |  |  |  |  | 823,000 | 330,000 | 300,000 |
Multiemployer Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expense under plans |  |  |  |  |  |  |  | $ 1,000,000 | $ 2,100,000 | 2,200,000 |
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 |  |  |
Plan No. 1 |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  | $ 100,000 | $ 30,000,000 |  | $ 10,000,000 |  |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  | 5.20% |  |  |
Percentage of total plan assets |  |  |  |  |  |  |  | 100.00% | 100.00% |  |
Plan No. 2 |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  | $ 600,000 |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  | 7.40% |  |  |
Required | Pension plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | $ 271,000 | $ 286,000 | 341,000 |
Required | Non Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 300,000 |  |  |
Discretionary | Pension plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 40,700,000 | $ 1,605,000 | $ 1,000,000 |
Discretionary | Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 40,700,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  |  |  |  |  | $ 5,000,000 |  |  |
Retiree medical coverage provided |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  |  |  |  |  | $ 35,000,000 |  |  |
Retiree medical coverage provided |  |  |  |  |  |  |  | 5 years |  |  |

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