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Acquisitions and Dispositions - Additional Information (Detail) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 01, 2017 USD ($) Facility T | Jan. 20, 2017 USD ($) Facility T | Jan. 09, 2017 USD ($) Facility T | Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 2,208,246,000 |  | $ 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 |  |  |  | 212,700,000 | $ 48,100,000 |
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 |  |  |
St. Louis Cold Drawn, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition approximate purchase price | $ 60,000,000 |  |  |  |  |
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 |  |  |  | $ 745,484,000 |  | $ 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 |  |  |  |

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