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Revenue - Schedule of Net Sales Disaggregates by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | $ 5,464,502 | $ 6,742,202 | $ 17,457,112 | $ 18,771,395
Sheet [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 1,513,884 | 2,051,634 | 5,071,027 | 5,692,281
Bar [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 979,082 | 1,243,890 | 3,173,289 | 3,592,475
Structural [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 378,670 | 503,733 | 1,214,355 | 1,348,987
Plate [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 372,837 | 602,353 | 1,438,651 | 1,518,100
Tubular Products [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 296,519 | 357,815 | 919,711 | 1,040,611
Rebar Fabrication [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 469,180 | 412,977 | 1,249,912 | 1,133,117
Other Steel Products [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 1,054,660 | 1,078,426 | 3,055,441 | 2,882,571
Raw Materials [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 399,670 | 491,374 | 1,334,726 | 1,563,253
Steel Mills [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 3,244,473 | 4,401,610 | 10,897,322 | 12,151,843
Steel Mills [Member] | Sheet [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 1,513,884 | 2,051,634 | 5,071,027 | 5,692,281
Steel Mills [Member] | Bar [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 979,082 | 1,243,890 | 3,173,289 | 3,592,475
Steel Mills [Member] | Structural [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 378,670 | 503,733 | 1,214,355 | 1,348,987
Steel Mills [Member] | Plate [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 372,837 | 602,353 | 1,438,651 | 1,518,100
Steel Products [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 1,820,359 | 1,849,218 | 5,225,064 | 5,056,299
Steel Products [Member] | Tubular Products [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 296,519 | 357,815 | 919,711 | 1,040,611
Steel Products [Member] | Rebar Fabrication [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 469,180 | 412,977 | 1,249,912 | 1,133,117
Steel Products [Member] | Other Steel Products [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 1,054,660 | 1,078,426 | 3,055,441 | 2,882,571
Raw Materials [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | 399,670 | 491,374 | 1,334,726 | 1,563,253
Raw Materials [Member] | Raw Materials [Member] |  |  |  |
Revenue from Contract with Customers [Line Items] |  |  |  |
Revenues | $ 399,670 | $ 491,374 | $ 1,334,726 | $ 1,563,253

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