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Revisions in Estimates - Summary of Impact of Revisions in Estimates to Gross Profit (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares
Change in Accounting Estimate [Line Items] |  |  |
Range of increase in gross profit from each project, net | $ 572,697 | $ 396,399 | $ 369,494
Increase to project profitability, net | 196,192 | 59,854 | 91,817
Increase to net income | 140,443 | 29,587 | 78,857
Increase to net income attributable to Granite Construction Incorporated | $ 126,346 | $ 43,599 | $ 83,302
Increase to net income/decrease to net loss per diluted share attributable to common shareholders (in dollars per share) | $ / shares | $ 2.62 | $ 0.97 | $ 1.70
Estimated Due to Production at Higher Rate |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Number of projects with upward estimate changes | 3 | 1 | 2
Range of increase in gross profit from each project, net |  | $ 8,100 |
Increase to project profitability, net | $ 25,600 | 8,100 | $ 12,100
Increase to net income | 18,300 | 6,900 | 9,700
Amounts attributable to non-controlling interests | 0 | 3,200 | 2,700
Increase to net income attributable to Granite Construction Incorporated | $ 18,300 | $ 3,600 | $ 7,000
Increase to net income/decrease to net loss per diluted share attributable to common shareholders (in dollars per share) | $ / shares | $ 0.35 | $ 0.07 | $ 0.13
Estimated Due to Production at Higher Rate | Minimum |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Range of increase in gross profit from each project, net | $ 6,100 |  | $ 5,400
Estimated Due to Production at Higher Rate | Maximum |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Range of increase in gross profit from each project, net | $ 10,300 |  | $ 6,800
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Number of projects with upward estimate changes | 4 | 6 | 8
Increase to project profitability, net | $ 50,200 | $ 96,900 | $ 92,200
Increase to net income | 37,000 | 79,600 | 74,100
Amounts attributable to non-controlling interests | 3,900 | 29,800 | 21,700
Increase to net income attributable to Granite Construction Incorporated | $ 33,100 | $ 49,800 | $ 52,400
Increase to net income/decrease to net loss per diluted share attributable to common shareholders (in dollars per share) | $ / shares | $ 0.63 | $ 0.95 | $ 1.00
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges | Minimum |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Range of increase in gross profit from each project, net | $ 5,600 | $ 5,100 | $ 5,600
Estimated Cost Recovery of Customer Affirmative Claims and Back Charges | Maximum |  |  |
Change in Accounting Estimate [Line Items] |  |  |
Range of increase in gross profit from each project, net | $ 24,200 | $ 54,900 | $ 32,200

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