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Related party transactions - Additional Information (Detail) - Alpha Steel [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Jun. 30, 2026
Related Party Transaction [Line Items] |  |  |
Purchases from Alpha Steel | $ 2.9 | $ 7.6 |
Ownership percentage |  |  | 45.00%

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