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Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 29, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Non-cash impairment charge |  |  |  | $ 613,640 | $ 66,916 | $ 110,000
Property, plant and equipment, net | $ 6,899,110 | $ 6,178,555 |  | 6,899,110 | 6,178,555 |
Steel Mills [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Non-cash impairment charge | 103,200 | 20,000 |  | $ 103,200 | 20,000 |
Land and Improvements, Net [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful lives range |  |  |  | 5 years |  |
Land and Improvements, Net [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful lives range |  |  |  | 25 years |  |
Buildings and Improvements [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful lives range |  |  |  | 4 years |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful lives range |  |  |  | 40 years |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful lives range |  |  |  | 2 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful lives range |  |  |  | 15 years |  |
Carrying Value of Two Field of Wells [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Non-cash impairment charge |  |  | $ 110,000 |  |  | $ 110,000
Carrying Value of Third Field of Wells [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Non-cash impairment charge |  | 35,000 |  |  | 35,000 |
Carrying Value of Three Field of Wells [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment, net | 71,700 | $ 78,900 |  | $ 71,700 | $ 78,900 |
Unproved Oil and Gas Properties [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Non-cash impairment charge | $ 27,000 |  |  | $ 27,000 |  |

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