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Long-Term Debt (Details) $ in Thousands							3 Months Ended		9 Months Ended		12 Months Ended	27 Months Ended
	Mar. 05, 2025 USD ($)	Jul. 30, 2024 USD ($) item	Mar. 11, 2024 USD ($)	Oct. 26, 2021	Sep. 02, 2020 USD ($)	Aug. 21, 2020 USD ($) shares	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2022 USD ($)	Nov. 02, 2021 USD ($)	Jul. 01, 2021 USD ($)	Jun. 01, 2021 USD ($)	Jan. 26, 2021 USD ($)	Jan. 04, 2021 USD ($)
Long-Term Debt
Total principal									$ 1,313,553				$ 1,497,185
Unamortized debt issuance costs									(6,333)				(7,955)
Long-term debt									1,307,220				1,489,230
Payments of deferred financing costs									1,078	$ 6,064
Aggregate principal amount converted								$ 26,051
Loss on early extinguishment of debt							$ 528		3,628	528
Credit Facility
Long-Term Debt
Credit facility									348,200				393,200
Senior Unsecured Revolving Credit Facility
Long-Term Debt
Credit facility									348,000				$ 393,000
Lender commitments									1,650,000
Available borrowing capacity									$ 1,300,000
Number of extensions | item		2
Renewal term		1 year
Number of financial covenants		1
Total indebtedness to capitalization ratio		65.00%
Basis spread on variable rate (as a percent)		0.10%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]									us-gaap:SecuredOvernightFinancingRateSofrMember
Floor rate (as a percent)		0.00%
Potential increase in lender commitments		$ 500,000
Weighted average interest rate (as a percent)									5.80%				5.90%
Outstanding letters of credit									$ 13,000				$ 13,000
Senior Unsecured Revolving Credit Facility | Minimum
Long-Term Debt
Credit ratings (as a percent)		1.125%
New credit facility, commitment fees (as a percent)		0.125%
Senior Unsecured Revolving Credit Facility | Maximum
Long-Term Debt
Credit ratings (as a percent)		2.00%
New credit facility, commitment fees (as a percent)		0.30%
Senior Secured Revolving Credit Facility | Minimum
Long-Term Debt
Commitment fees on the unused portion (as a percent)				0.375%
Senior Secured Revolving Credit Facility | Minimum | Not Investment Grade Period
Long-Term Debt
Basis spread on variable rate (as a percent)				1.75%
Senior Secured Revolving Credit Facility | Minimum | Investment Grade Period
Long-Term Debt
Basis spread on variable rate (as a percent)				1.25%
Senior Secured Revolving Credit Facility | Maximum
Long-Term Debt
Commitment fees on the unused portion (as a percent)				0.50%
Senior Secured Revolving Credit Facility | Maximum | Not Investment Grade Period
Long-Term Debt
Basis spread on variable rate (as a percent)				2.75%
Senior Secured Revolving Credit Facility | Maximum | Investment Grade Period
Long-Term Debt
Basis spread on variable rate (as a percent)				1.875%
8.375% Senior Notes Due 2026
Long-Term Debt
Senior notes													$ 96,870						$ 500,000
Interest rate (as a percent)													8.375%						8.375%
Issue price as percentage of par value																			100.00%
Redemption price	102.094%
Redemption amount	$ 97,000
8.375% Senior Notes Due 2026 | Debt Repurchase Program
Long-Term Debt
Redemption amount																$ 175,000
Carrying value of debt repurchased														$ 228,000
7.625% Senior Notes Due 2029
Long-Term Debt
Senior notes									$ 365,353				$ 407,115					$ 700,000
Interest rate (as a percent)									7.625%				7.625%					7.625%
Amount of debt repurchased									$ 42,000
Repurchase price percentage									103.00%
Redemption price									102.542%
Redemption price of the debt instrument in the event of change of control (as a percent)									101.00%
Redemption amount															$ 293,000
7.625% Senior Notes Due 2029 | On or after February 1, 2027
Long-Term Debt
Redemption price									100.00%
5.375% senior notes due 2030
Long-Term Debt
Senior notes									$ 600,000				$ 600,000				$ 600,000
Interest rate (as a percent)									5.375%				5.375%				5.375%
Issue price as percentage of par value																	100.00%
Redemption price									102.688%
Redemption price of the debt instrument in the event of change of control (as a percent)									101.00%
5.375% senior notes due 2030 | On or after March 1, 2028
Long-Term Debt
Redemption price									100.00%
4.25% convertible senior notes due 2026
Long-Term Debt
Convertible senior notes					$ 37,500	$ 250,000	$ 0			$ 0
Interest rate (as a percent)						4.25%
Issuance of convertible notes					278,500
Payments of deferred financing costs					$ 9,000
Amount of debt extinguished											$ 206,000
Amount of debt converted												$ 81,000
Redemption price			100.00%
Shares issued on conversion | shares						230.2026
Aggregate principal amount converted			$ 26,000					$ 26,000
Shares issued to cover conversions (in shares) | shares								6,000,000

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Floor on percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The principal amount of debt redeemed.

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The aggregate borrowing capacity under the credit facility, consisting of the maximum borrowing capacity plus the contingent increase, subject to the agreement of Antero Resources and new or existing lenders under the credit facility.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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