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Postretirement Plans - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 4 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Oct. 06, 2018 | Jul. 14, 2018 | Oct. 07, 2017 | Apr. 21, 2018 | Oct. 06, 2018 | Oct. 07, 2017 | Dec. 30, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Defined benefit plans estimated final non-cash settlement charge |  |  |  | $ 125,000,000 |  |  |  | $ 125,000,000 |  |
Discount rate used to derive estimated plan |  |  |  | 3.47% |  |  |  | 3.47% |  |
Expected long-term rate of return on plan assets | 5.20% | 5.90% | 5.90% |  |  |  |  |  |  |
Total cost and employer contributions |  |  |  | $ 6,000,000 |  | $ 6,500,000 |  | $ 19,600,000 | $ 22,000,000 |
Multiemployer plan, withdrawal obligation |  |  |  |  |  | $ 15,200,000 |  |  | $ 15,200,000 | $ 15,223,000
Multiemployer plans, increase in withdrawal obligation |  |  |  |  |  |  | $ 2,300,000 |  |  |
Multiemployer plans transition payments payable |  |  |  | 3,100,000 |  |  |  | $ 3,100,000 |  |
Multiemployer plans payable date |  |  |  |  |  |  |  | Nov. 03, 2017 |  |
Multiemployer plan withdrawal liability of net present value monthly payments period |  |  |  |  |  | 20 years |  |  |  |
Multiemployer plan, withdrawal obligation paid |  |  |  |  |  |  | 200,000 |  |  |
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 |  |  |
Plan No. 2 |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  | 600,000 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  | 5,000,000 |  |  |  | $ 5,000,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Required cash contribution to fully fund under defined benefit plans |  |  |  | $ 35,000,000 |  |  |  | $ 35,000,000 |  |

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- Definition Multiemployer plans tax payments payable date. + References No definition available. + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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