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Revisions in Estimates (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) project $ / shares	Mar. 31, 2025 USD ($) project $ / shares
Change in Accounting Estimate [Line Items]
Range of change in gross profit from each project, net	$ 109,905	$ 83,849
Changes to net income (loss) attributable to Granite Construction Incorporated	$ (41,699)	$ (33,656)
Net income per share, diluted (USD per share) | $ / shares	$ (0.96)	$ (0.77)
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 | project	1
Range of change in gross profit from each project, net		$ 8,300
Income (loss) attributable to noncontrolling interest, before tax		0
Changes to net income (loss) attributable to Granite Construction Incorporated		$ 6,200
Net income per share, diluted (USD per share) | $ / shares		$ 0.14
Revisions in Estimates, Decrease
Change in Accounting Estimate [Line Items]
Number of projects with estimate changes | project		1
Range of change in gross profit from each project, net	$ 8,800
Income (loss) attributable to noncontrolling interest, before tax	0
Changes to net income (loss) attributable to Granite Construction Incorporated	$ 6,600
Net income per share, diluted (USD per share) | $ / shares	$ 0.15

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