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Equity Investments - Additional Information (Detail) € in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2019 USD ($) | Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Sep. 28, 2019 USD ($) Sheet | Sep. 29, 2018 USD ($) | Sep. 28, 2019 EUR (€) | Jan. 16, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments |  | $ 826,100,000 |  | $ 826,100,000 |  |  |  | $ 869,900,000 |
Amortization |  |  |  | 64,655,000 | $ 66,684,000 |  |  |  |
NuMit LLC [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments |  | $ 323,900,000 |  | $ 323,900,000 |  |  |  | 337,200,000 |
Equity method investment, ownership percentage |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Period used for lag basis, in months |  |  |  | 1 month |  |  |  |  |
Distributions from affiliates |  |  |  | $ 27,400,000 | 28,300,000 |  |  |  |
Steel Technologies LLC [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 100.00% |  | 100.00% |  | 100.00% |  |  |
Number of sheet processing facilities operated by Steel Technologies | Sheet |  |  |  | 26 |  |  |  |  |
Duferdofin Nucor S.r.l. [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments |  | $ 256,000,000.0 |  | $ 256,000,000.0 |  |  |  | 269,100,000 |
Equity method investment, ownership percentage |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Period used for lag basis, in months |  |  |  | 1 month |  |  |  |  |
Equity method investments, share of net assets |  | $ 107,000,000.0 |  | $ 107,000,000.0 |  |  |  |  |
Basis difference due to the step-up to fair value of certain assets and liabilities |  | 149,000,000.0 |  | 149,000,000.0 |  |  |  |  |
Step-up to fair value of equity method investment, portion related to identification of goodwill |  |  |  | 84,300,000 |  |  |  |  |
Amortization |  | 2,200,000 | $ 2,300,000 | 6,700,000 | $ 7,100,000 |  |  |  |
Due from related parties, noncurrent |  | 38,300,000 |  | $ 38,300,000 |  | € 35.0 |  | 40,200,000 | € 35.0
Interest rate per year in excess of Euribor as of date of the notes |  |  |  | 0.75% |  |  |  |  |
Equity method investments notes payable with parent company, maturity date |  |  |  | Jan. 31, 2022 |  |  |  |  |
Duferdofin Nucor S.r.l. [Member] | Facility A [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments credit facilities subject to guarantee, amount |  | 175,100,000 |  | $ 175,100,000 |  | 160.0 |  |  |
Total amount outstanding under equity method investments credit facilities |  | $ 168,500,000 |  | $ 168,500,000 |  | € 154.0 |  | 178,000,000.0 | € 155.0
Guarantor obligation percentage of exposure in case of default |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Line of credit facility, maturity period |  |  |  | Apr. 16, 2021 |  |  |  |  |
Nucor-JFE [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments |  | $ 150,100,000 |  | $ 150,100,000 |  |  |  | $ 135,700,000 |
Equity method investment, ownership percentage |  | 50.00% |  | 50.00% |  | 50.00% | 50.00% |  |
Nucor-JFE [Member] | General Financing Agreement and Promissory Note [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investments credit facilities subject to guarantee, amount |  |  |  |  |  |  | $ 65,000,000.0 |  |
Total amount outstanding under equity method investments credit facilities |  | $ 30,000,000.0 |  | $ 30,000,000.0 |  |  |  |  |
Guarantor obligation percentage of exposure in case of default |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Nucor-JFE [Member] | Uncommitted Loan Facility and Promissory Note [Member] |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Guarantee of debt | $ 17,500,000 |  |  |  |  |  |  |  |
Guarantee of debt, plus interest and fees | $ 20,000,000.0 |  |  |  |  |  |  |  |
Equity method investments credit facilities, maturity date | Jul. 31, 2024 |  |  |  |  |  |  |  |
Equity method investments credit facilities, amount | $ 35,000,000.0 |  |  |  |  |  |  |  |

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