Annual production capacity.

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- Definition

Approximate number of tons shipped annually.

+ References

No definition available.

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- Definition

Number of production facilities that are part of acquisition.

+ References

No definition available.

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- Definition

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.

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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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 T	Jan. 09, 2017 USD ($) Facility T	Oct. 31, 2016 USD ($) Facility T	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 2,196,058	$ 2,052,728	$ 2,011,278
Republic [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price		$ 331,600
Approximate annual shipment tons \| T		140,000
Number of manufacturing facilities \| Facility		2
Goodwill		$ 115,562
ITC [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price				$ 430,100
Number of manufacturing facilities \| Facility				4
Goodwill				$ 29,522
Annual production capacity \| T				650,000
ITC [Member] \| Alabama [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility				2
ITC [Member] \| Illinois [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility				2
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price					212,700	50,100	19,100
Southland [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price			$ 130,000
Approximate annual shipment tons \| T			235,000
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
Approximate annual shipment tons \| T	200,000
Number of manufacturing facilities \| Facility	2
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
Steel Mills [Member]
Business Acquisition [Line Items]
Goodwill					$ 745,484	$ 620,156	$ 590,634
Steel Mills [Member] \| Republic [Member]
Business Acquisition [Line Items]
Goodwill		115,600
Goodwill expected to be deductible for tax purposes		$ 118,600
Steel Mills [Member] \| ITC [Member]
Business Acquisition [Line Items]
Goodwill				$ 29,500
Goodwill expected to be deductible for tax purposes				$ 30,500