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Summary of significant accounting policies - Production and Ad Valorem taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Production Tax Expense	$ 24.9	$ 26.9	$ 17.1
Ad valorem taxes	$ 2.8	$ 3.7	$ 1.0

X

- Definition

Taxes incurred on the value of its oil and natural gas properties in Texas, Louisiana and Oklahoma.

+ References

No definition available.

+ Details

Name:	grnt_AdValoremTaxExpense
Namespace Prefix:	grnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

A tax assessed on oil and gas production.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_ProductionTaxExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration