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