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Receivables, net (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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