Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Thousands	6 Months Ended
Jun. 29, 2019 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 2,184,336
Translation	3,489
Reclassifications	0
Balance, end of period	2,187,825
Steel Mills [Member]
Goodwill [Line Items]
Balance, beginning of period	591,986
Translation	0
Reclassifications	0
Balance, end of period	591,986
Steel Products [Member]
Goodwill [Line Items]
Balance, beginning of period	862,773
Translation	3,489
Reclassifications	0
Balance, end of period	866,262
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	729,577
Translation	0
Reclassifications	0
Balance, end of period	$ 729,577

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-Topic 350
-SubTopic 20
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