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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)