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Revisions in Estimates - Summary of Impact of Revisions in Estimates to Gross Profit (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) project $ / shares	Mar. 31, 2024 USD ($) project $ / shares
Change in Accounting Estimate [Line Items]
Range of change in gross profit from each project, net	$ 83,849	$ 54,285
Changes to project profitability, net	(40,083)	(38,968)
Changes to net income (loss)	(28,327)	(29,442)
Changes to net income (loss) attributable to Granite Construction Incorporated	$ (33,656)	$ (30,983)
Net income per share, diluted (USD per share) | $ / shares	$ (0.77)	$ (0.70)
Revisions in Estimates
Change in Accounting Estimate [Line Items]
Range of change in gross profit from each project, net	$ 5,000
Revisions in Estimates, Increase
Change in Accounting Estimate [Line Items]
Number of projects with estimate changes	1	1
Range of change in gross profit from each project, net	$ 8,300	$ 7,400
Changes to project profitability, net	8,300	7,400
Changes to net income (loss)	6,200	5,600
Changes to net income (loss) attributable to Granite Construction Incorporated	$ 6,200	$ 5,600
Net income per share, diluted (USD per share) | $ / shares	$ 0.14	$ 0.13
Revisions in Estimates, Decrease
Change in Accounting Estimate [Line Items]
Number of projects with estimate changes | project	1	1
Range of change in gross profit from each project, net	$ 8,800	$ 7,700
Changes to project profitability, net	8,800	7,700
Changes to net income (loss)	6,600	5,800
Changes to net income (loss) attributable to Granite Construction Incorporated	$ 6,600	$ 5,800
Net income per share, diluted (USD per share) | $ / shares	$ 0.15	$ 0.13

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