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Construction Joint Ventures - Schedule of Unconsolidated Construction Joint Ventures Revenue and Costs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Guarantor Obligations [Line Items] |  |
Cost of revenue | $ 802,560 | $ 615,698
Changes to net income (loss) | (36,389) | (28,327)
Granite’s interest in net income (loss) | (1,387) | (1,246)
Collaborative Arrangement |  |
Guarantor Obligations [Line Items] |  |
Revenue | 1,484 | 4,917
Cost of revenue | 670 | 3,950
Granite’s interest in gross profit | 814 | 967
Granite’s interest in net income (loss) | 1,387 | 1,216
Collaborative Arrangement | Corporate Joint Venture |  |
Guarantor Obligations [Line Items] |  |
Revenue | 6,684 | 4,071
Cost of revenue | 3,289 | 17,534
Changes to net income (loss) | 4,424 | (12,462)
Collaborative Arrangement | Co-venturer | Other Partners Interest in Partnerships |  |
Guarantor Obligations [Line Items] |  |
Revenue | 5,200 | (846)
Cost of revenue | 2,619 | 13,584
Changes to net income (loss) | $ 3,037 | $ (13,678)

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