XML 47 R35.htm IDEA: XBRL DOCUMENT v3.23.1

Summary of Significant Accounting Policies - Oil and natural gas properties (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounting Policies [Abstract]
Depletion and accretion recognized	$ 33.8	$ 16.1

X

- Definition

The noncash expense charged against earnings to recognize the consumption of oil and gas reserves that are part of an entities' assets.

+ References

No definition available.

+ Details

Name:	grnt_DepletionAndAccretionRecognized
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