Investments in Affiliates - Summarized Balance Sheet Information for Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investments in and Advances to Affiliates [Line Items]
Current assets	$ 1,643,451	$ 1,347,296
Total assets	2,813,540	2,167,933
Current liabilities	1,029,883	797,594
Granite’s share of net assets	92,910	80,725
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in and Advances to Affiliates [Line Items]
Current assets	204,897	194,210
Noncurrent assets	159,694	172,560
Total assets	364,591	366,770
Current liabilities	81,899	106,780
Long-term liabilities	54,591	59,356
Total liabilities	136,490	166,136
Net assets	$ 228,101	$ 200,634