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Investments in Affiliates - Summarized Balance Sheet Information for Equity Method Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]    
Current assets $ 1,604,706 $ 1,812,231
Total assets 3,779,639 4,030,393
Current liabilities 1,478,842 1,481,745
Granite’s share of net assets 97,985 96,764
Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Schedule of Equity Method Investments [Line Items]    
Current assets 211,506 215,601
Noncurrent assets 118,458 122,280
Total assets 329,964 337,881
Current liabilities 70,717 73,005
Long-term liabilities 43,571 51,087
Total liabilities 114,288 124,092
Net assets $ 215,676 $ 213,789