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Derivatives and Fair Value Measurements - Volume of Company 's Activity in Derivative Instruments (Detail) $ in Millions | Jun. 30, 2025 USD ($) T gal | Dec. 31, 2024 USD ($) T gal
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Hot Roll Coil Swap Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 17,204 | 31,658
Aluminum Swap Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 8,233 | 15,711
Nickel Swap Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 389 | 298
Copper Swap Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 2,274 | 1,319
Natural Gas Swap Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | gal | 215,080 | 283,000
Diesel Fuel Swap Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | gal | 1,916,000 | 1,176,000
Foreign Exchange Contracts [Member] |  |
Derivatives Fair Value [Line Items] |  |
Derivative notional amount | $ | $ 3.4 | $ 1.6

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