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v3.20.4

Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Cash equivalents original maturity period | three months or less

X
- Definition The maturity period for an instrument to be considered a cash equivalent. + References No definition available. + Details
Name: | nue_CashEquivalentMaturityPeriod
Namespace Prefix: | nue_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration