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v3.26.1

Receivables, net (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Receivables [Abstract] |  |
Working capital contributions | $ 25.0 | $ 25.0
Percentage of receivables | 10.00% | 10.00%

X
- Definition Represents maximum individually percentage of net receivables. + References No definition available. + Details
Name: | gva_PercentageOfNetReceivablesIndividuallyMaximum
Namespace Prefix: | gva_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the value of total current assets net of current liabilities as of the balance sheet date. + References No definition available. + Details
Name: | gva_WorkingCapitalDeficit
Namespace Prefix: | gva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration