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Revisions in Estimates (Tables) | 12 Months Ended
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Dec. 31, 2024
Accounting Changes and Error Corrections [Abstract] |
Summary of Impact of Revisions in Estimates to Gross Profit | The projects with increases and decreases from revisions in estimates, which individually had an impact of $5.0 million or more on gross profit, are summarized as follows (dollars in millions, except per share data): Increases
Years Ended December 31, | 2024 |  | 2023 |  | 2022
Number of projects with upward estimate changes |  | 3 |  |  | 1 |  |  | 2
Range of increase in gross profit from each project, net | $ | 6.1 - 10.3 |  | $ | 8.1 |  | $ | 5.4 - 6.8
Increase to project profitability, net | $ | 25.6 |  |  | $ | 8.1 |  |  | $ | 12.1 |
Increase to net income | $ | 18.3 |  |  | $ | 6.9 |  |  | $ | 9.7 |
Amounts attributable to non-controlling interests | $ | — |  |  | $ | 3.2 |  |  | $ | 2.7 |
Increase to net income attributable to Granite Construction Incorporated | $ | 18.3 |  |  | $ | 3.6 |  |  | $ | 7.0 |
Increase to net income per diluted share attributable to common shareholders | $ | 0.35 |  |  | $ | 0.07 |  |  | $ | 0.13 |
Years Ended December 31, | 2024 |  | 2023 |  | 2022
Number of projects with downward estimate changes |  | 4 |  |  | 6 |  |  | 8
Range of reduction in gross profit from each project, net |  | $5.6 - 24.2 |  |  | $5.1 - 54.9 |  |  | $5.6 - 32.2
Decrease to project profitability, net | $ | 50.2 |  |  | $ | 96.9 |  |  | $ | 92.2 |
Decrease to net income | $ | 37.0 |  |  | $ | 79.6 |  |  | $ | 74.1 |
Amounts attributable to non-controlling interests | $ | 3.9 |  |  | $ | 29.8 |  |  | $ | 21.7 |
Decrease to net income attributable to Granite Construction Incorporated | $ | 33.1 |  |  | $ | 49.8 |  |  | $ | 52.4 |
Decrease to net income per diluted share attributable to common shareholders | $ | 0.63 |  |  | $ | 0.95 |  |  | $ | 1.00 |

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- Definition Tabular disclosure of the change in an accounting estimate, including a change that occurs in an interim period. If a change in accounting estimate affects several future periods (for example, a change in the service life of a depreciable asset) disclose the effect on income from continuing operations, net income (or other appropriate captions of changes in the applicable net assets or performance indicator), and any related per-share amounts of the current period. Disclosure of the effects of a change in an accounting estimate that occurs in the ordinary course of business (such as uncollectible accounts or inventory obsolescence) is not required, unless the effect is material. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482989/270-10-45-14 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483443/250-10-50-4 + Details
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