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v3.22.2.2

Risk concentrations (Details) | 9 Months Ended
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Sep. 30, 2022
Risk concentrations |
Percentage of partnership wells operated by third party operating partners | 100.00%

X
- Definition Percentage of partnership wells operated by third party operating partners. + References No definition available. + Details
Name: | grnt_PercentageOfPartnershipWellsOperatedByThirdPartyOperatingPartners
Namespace Prefix: | grnt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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