Approximate number of tons shipped annually.

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- Definition

Number of production facilities that are part of acquisition.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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- Definition

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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Acquisitions and Dispositions - Additional Information (Detail) $ in Thousands				12 Months Ended
	Sep. 01, 2017 USD ($) Facility T	Jan. 20, 2017 USD ($) Facility	Jan. 09, 2017 USD ($) Facility	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 2,201,063	$ 2,184,336	$ 2,196,058
Steel Products [Member]
Business Acquisition [Line Items]
Goodwill				879,500	862,773	720,997
Republic [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price		$ 331,600
Number of manufacturing facilities \| Facility		2
Goodwill		$ 115,562
Republic [Member] \| Steel Products [Member]
Business Acquisition [Line Items]
Goodwill		115,600
Goodwill expected to be deductible for tax purposes		$ 118,600
Republic [Member] \| Kentucky [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility		1
Republic [Member] \| Georgia [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility		1
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price				$ 83,100	$ 33,100	$ 212,700
Southland [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price			$ 130,000
Southland [Member] \| Alabama [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility			1
St. Louis Cold Drawn, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price	$ 60,000
Number of manufacturing facilities \| Facility	2
Approximate annual shipment tons \| T	200,000
St. Louis Cold Drawn, Inc. [Member] \| St Louis Missouri [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility	1
St. Louis Cold Drawn, Inc. [Member] \| Monterrey, Mexico [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility	1