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Long-Term Debt (Details) - USD ($)		9 Months Ended
Long-Term Debt (Details) - USD ($)	Oct. 26, 2017	Sep. 30, 2018	Oct. 31, 2018	Oct. 30, 2018	Dec. 31, 2017	Dec. 21, 2016	Sep. 13, 2016	Mar. 17, 2015	Sep. 18, 2014	May 06, 2014	Nov. 05, 2013
Long- term Debt
Net unamortized premium		$ 1,312,000			$ 1,520,000
Net unamortized debt issuance costs		(28,162,000)			(32,430,000)
Long-term debt		5,487,004,000			4,800,090,000
Antero Midstream Partners LP
Long- term Debt
Net unamortized debt issuance costs		(8,146,000)			(9,000,000)
Outstanding letters of credit		0
Midstream Credit Facility \| Antero Midstream Partners LP
Long- term Debt
Bank credit facility long-term debt		875,000,000			$ 555,000,000
Maximum amount of the Credit Facility		$ 1,500,000,000	$ 2,000,000,000	$ 1,500,000,000
Weighted average interest rate (as a percent)		3.39%			2.81%
Midstream Credit Facility \| Minimum
Long- term Debt
Commitment fees on the unused portion during an Investment Grade period (as a percent)	0.175%
Midstream Credit Facility \| Minimum \| Antero Midstream Partners LP
Long- term Debt
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)		0.25%
Midstream Credit Facility \| Minimum \| Not Investment Grade Period \| Antero Midstream Partners LP
Long- term Debt
Basis points added to the reference rate		25.00%
Midstream Credit Facility \| Minimum \| Investment Grade Period \| Antero Midstream Partners LP
Long- term Debt
Basis points added to the reference rate		12.50%
Midstream Credit Facility \| Maximum
Long- term Debt
Commitment fees on the unused portion during an Investment Grade period (as a percent)	0.375%
Midstream Credit Facility \| Maximum \| Antero Midstream Partners LP
Long- term Debt
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)		0.375%
Midstream Credit Facility \| Maximum \| Not Investment Grade Period \| Antero Midstream Partners LP
Long- term Debt
Basis points added to the reference rate		225.00%
Midstream Credit Facility \| Maximum \| Investment Grade Period \| Antero Midstream Partners LP
Long- term Debt
Basis points added to the reference rate		200.00%
Credit Facility
Long- term Debt
Bank credit facility long-term debt		$ 547,000,000			$ 185,000,000
Current borrowing base		4,500,000,000
Lender commitments		$ 2,500,000,000
Time period prior to maturity date of senior notes as one option for maturity date of Credit Facility	91 years
Weighted average interest rate (as a percent)		3.75%			2.96%
Outstanding letters of credit		$ 692,000,000			$ 705,000,000
Credit Facility \| Minimum
Long- term Debt
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)		0.30%
Commitment fees on the unused portion during an Investment Grade period (as a percent)		0.15%
Credit Facility \| Minimum \| Not Investment Grade Period
Long- term Debt
Basis points added to the reference rate		25.00%
Credit Facility \| Minimum \| Investment Grade Period
Long- term Debt
Basis points added to the reference rate		12.50%
Credit Facility \| Maximum
Long- term Debt
Commitment fees on the unused portion during any period that is not an Investment Grade Period (as a percent)		0.375%
Commitment fees on the unused portion during an Investment Grade period (as a percent)		0.30%
Credit Facility \| Maximum \| Not Investment Grade Period
Long- term Debt
Basis points added to the reference rate		225.00%
Credit Facility \| Maximum \| Investment Grade Period
Long- term Debt
Basis points added to the reference rate		175.00%
5.375% senior notes due 2021
Long- term Debt
Long-term notes payable		$ 1,000,000,000			1,000,000,000
Interest rate (as a percent)											5.375%
Senior notes issued											$ 1,000,000,000
Issue price as percentage of par value											100.00%
Redemption price		102.688%
Redemption price at which notes may be required to be repurchased in event of change of control		101.00%
5.375% senior notes due 2021 \| On or after November 1, 2019
Long- term Debt
Redemption price		100.00%
Stand-alone revolving note
Long- term Debt
Maximum amount of the Credit Facility		$ 25,000,000
Outstanding balance		$ 0			0
Stand-alone revolving note \| Lender's Prime Rate
Long- term Debt
Basis spread on variable rate (as a percent)		1.00%
5.125 senior notes due 2022
Long- term Debt
Long-term notes payable		$ 1,100,000,000			1,100,000,000
Interest rate (as a percent)										5.125%
Senior notes issued									$ 500,000,000	$ 600,000,000
Issue price as percentage of par value									100.50%	100.00%
Redemption price		102.563%
Redemption price at which notes may be required to be repurchased in event of change of control		101.00%
5.125 senior notes due 2022 \| On or after June 1, 2020
Long- term Debt
Redemption price		100.00%
5.625% senior notes due 2023
Long- term Debt
Long-term notes payable		$ 750,000,000			750,000,000
Interest rate (as a percent)								5.625%
Senior notes issued								$ 750,000,000
Issue price as percentage of par value								100.00%
Redemption price		104.219%
Redemption price at which notes may be required to be repurchased in event of change of control		101.00%
5.625% senior notes due 2023 \| On Or After June 1, 2021
Long- term Debt
Redemption price		100.00%
5.375% senior notes due 2024 \| Antero Midstream Partners LP
Long- term Debt
Long-term notes payable		$ 650,000,000			650,000,000
Interest rate (as a percent)							5.375%
Senior notes issued							$ 650,000,000
Issue price as percentage of par value							100.00%
Redemption price at which notes may be required to be repurchased in event of change of control		101.00%
5.375% senior notes due 2024 \| On or after September 15, 2019 \| Antero Midstream Partners LP
Long- term Debt
Redemption price		104.031%
5.375% senior notes due 2024 \| On or after September 15, 2022 \| Antero Midstream Partners LP
Long- term Debt
Redemption price		100.00%
5.375% senior notes due 2024 \| On or before September 15, 2019 \| Antero Midstream Partners LP
Long- term Debt
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings		35.00%
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)		105.375%
5.375% senior notes due 2024 \| Prior to September 15, 2019 \| Antero Midstream Partners LP
Long- term Debt
Redemption price		100.00%
5.00% senior notes due 2025
Long- term Debt
Long-term notes payable		$ 600,000,000			$ 600,000,000	$ 600,000,000
Interest rate (as a percent)						5.00%
Issue price as percentage of par value						100.00%
Redemption price at which notes may be required to be repurchased in event of change of control		101.00%
5.00% senior notes due 2025 \| Prior to March 1, 2020
Long- term Debt
Redemption price		100.00%
5.00% senior notes due 2025 \| On or before March 1, 2020
Long- term Debt
Percentage of the principal amount of the debt instrument which the entity may redeem with the proceeds from certain equity offerings		35.00%
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)		105.00%
5.00% senior notes due 2025 \| On or after March 1, 2020
Long- term Debt
Redemption price		103.75%
5.00% senior notes due 2025 \| On or after March1, 2023
Long- term Debt
Redemption price		100.00%