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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- 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
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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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
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Acquisitions and Dispositions - Additional Information (Detail)			6 Months Ended
	Jan. 20, 2017 USD ($) Facility T	Jan. 09, 2017 USD ($) Facility T	Jul. 01, 2017 USD ($)	Jul. 02, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 2,179,641,000		$ 2,052,728,000
Republic [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price	$ 331,600,000
Approximate annual shipment tons \| T	146,000
Number of manufacturing facilities \| Facility	2
Goodwill	$ 115,562,000
Other Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price			150,800,000	$ 0
Southland [Member]
Business Acquisition [Line Items]
Business acquisition approximate purchase price		$ 130,000,000
Approximate annual shipment tons \| T		240,000
Southland [Member] \| Alabama [Member]
Business Acquisition [Line Items]
Number of manufacturing facilities \| Facility		1
Steel Mills [Member]
Business Acquisition [Line Items]
Goodwill			$ 745,484,000		$ 620,156,000
Steel Mills [Member] \| Republic [Member]
Business Acquisition [Line Items]
Goodwill	115,600,000
Goodwill expected to be deductible for tax purposes	$ 118,600,000