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Joint Ventures and Noncontrolling Interests (Details) - item	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015	Dec. 15, 2015	Sep. 11, 2015
Joint Ventures and Noncontrolling Interests
Number of joint ventures in which the entity has a noncontrolling interest	2
Valex Corp. | South Korea
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated investments other than equity method investment	95.00%
Indiana Pickling & Processing Company
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated investments other than equity method investment	56.00%
Feralloy Processing Company
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated investments other than equity method investment	51.00%
Eagle Steel Products, Inc.
Joint Ventures and Noncontrolling Interests
Ownership percentage in equity method investment	45.00%
Acero Prime S. de R.L. de C.V.
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated investments other than equity method investment	60.00%
Oregon Feralloy Partners LLC
Joint Ventures and Noncontrolling Interests
Ownership percentage in equity method investment	40.00%
Minimum
Joint Ventures and Noncontrolling Interests
Ownership percentage in equity method investment	20.00%
Percentage of ownership for consolidation of financial statements	50.00%
Minimum | Valex Corp.
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated subsidiary			97.00%
Minimum | Valex Corp. | People's Republic of China
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated subsidiary				92.00%
Maximum
Joint Ventures and Noncontrolling Interests
Ownership percentage in equity method investment	50.00%
Maximum | Valex Corp.
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated subsidiary		100.00%
Maximum | Valex Corp. | People's Republic of China
Joint Ventures and Noncontrolling Interests
Ownership percentage in consolidated subsidiary		100.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the consolidated subsidiary.

+ References

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- Definition

Represents the number of joint ventures in which the entity has a noncontrolling interest.

+ References

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- Definition

Represents the percentage of ownership in another entity's common stock, held directly or indirectly by the parent, for consolidation of financial statements.

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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