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Equity Investments - Additional Information (Detail) $ in Thousands, € in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Sep. 30, 2017 USD ($) Sheet | Oct. 01, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment | $ 695,200 |  | $ 695,200 |  |  | $ 663,400 |
Distributions from affiliates |  |  | 48,037 | $ 38,474 |  |  |
Amortization expense due to fair value step-up |  |  | 68,394 | 54,066 |  |  |
NuMit LLC [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment | $ 311,900 |  | $ 311,900 |  |  | 325,100 |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  | 50.00% |  |
Period used for lag basis, in months |  |  | 1 month |  |  |  |
Distributions from affiliates | $ 100 | $ 500 | $ 47,000 | 37,500 |  |  |
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 |  |  | 25 |  |  |  |
Duferdofin Nucor S.r.l. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investment | $ 280,800 |  | $ 280,800 |  |  | 256,600 |
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 | $ 112,600 |  | $ 112,600 |  |  |  |
Basis difference due to the step-up to fair value of certain assets and liabilities | 168,200 |  | 168,200 |  |  |  |
Step-up to fair value of equity method investment, portion related to identification of goodwill | 91,000 |  |  |  |  |  |
Amortization expense due to fair value step-up | 2,300 | $ 2,200 | 6,600 | $ 6,600 |  |  |
Due from related parties, noncurrent | 41,300 |  | $ 41,300 |  | € 35.0 | 36,900 | € 35.0
Notes receivable, related parties, interest rate |  |  | 0.83% |  |  |  |
Interest rate per year in excess of Euribor as of date of the notes |  |  | 1.00% |  |  |  |
Equity method investments notes payable with parent company, maturity date |  |  | Jan. 31, 2019 |  |  |  |
Facility A [Member] | Duferdofin Nucor S.r.l. [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity method investments credit facilities, amount | 144,600 |  | $ 144,600 |  | 122.5 |  |
Total amount outstanding under equity method investments credit facilities | $ 144,600 |  | $ 144,600 |  | € 122.5 | $ 112,700 | € 107.0
Guarantor obligation percentage of exposure in case of default | 50.00% |  | 50.00% |  | 50.00% |  |
Line of credit facility, maturity period |  |  | Oct. 12, 2018 |  |  |  |

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