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Risk Concentrations (Details)	6 Months Ended
	Jun. 30, 2025
Risks and Uncertainties [Abstract]
Percentage of wells operated by third-party operating partners	100.00%

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- Definition

Percentage of Partnership's wells are operated by third-party operating partners.

+ References

No definition available.

+ Details

Name:	grnt_PercentageOfWellsOperatedByThirdPartyOperatingPartners
Namespace Prefix:	grnt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration