Investments in Affiliates - Summarized Statement of Operations for Equity Method Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments in and Advances to Affiliates [Line Items]
Revenue	$ 3,509,138	$ 3,301,256	$ 3,501,865
Range of increase in gross profit from each project, net	396,399	369,494	362,645
Increase to project profitability, net	59,854	91,817	22,127
Increase to net income	29,587	78,857	2,414
Granite’s interest in affiliates’ net income	25,748	13,571	12,586
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in and Advances to Affiliates [Line Items]
Revenue	476,361	377,256	302,084
Range of increase in gross profit from each project, net	142,139	95,816	74,939
Increase to project profitability, net	99,108	60,513	38,261
Increase to net income	$ 86,124	$ 47,331	$ 33,864