Revenue (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Agreements
Third party out of pocket costs reimbursement (as a percent)	3.00%
Minimum volume commitment that require Antero to pay for high pressure lines	75.00%
Minimum volume commitment that require Antero to pay for compressor stations	70.00%
Term of new construction	10 years
Gathering And Compression Agreement
Agreements
Notice period	180 days
Rebate issued	$ 12
Water Services Agreement
Agreements
Notice period	180 days
Third party out of pocket costs reimbursement (as a percent)	3.00%

Represents information related to agreements.

No definition available.

Name:	amgp_Agreements
Namespace Prefix:	amgp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum volume commitments that require Antero to utilize or pay certain percentage of the capacity of such new construction of compressor stations.

+ References

No definition available.

+ Details

Name:	amgp_GatheringAndCompressionAgreementMinimumVolumeCommitmentThatRequireAnteroToPayForCompressorStations
Namespace Prefix:	amgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum volume commitments that require Antero to utilize or pay certain percentage of the capacity of such new construction for high pressure lines.

+ References

No definition available.

+ Details

Name:	amgp_GatheringAndCompressionAgreementMinimumVolumeCommitmentThatRequireAnteroToPayForHighPressureLines
Namespace Prefix:	amgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The period prior to which notice to be served for the termination of the contract.

+ References

No definition available.

+ Details

Name:	amgp_MinimumNoticePeriodForTerminationOfContract
Namespace Prefix:	amgp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of rebate issued based on volumetric targets achieved.

+ References

No definition available.

+ Details

Name:	amgp_RebateIssued
Namespace Prefix:	amgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Term of construction.

+ References

No definition available.

+ Details

Name:	amgp_TermOfConstruction
Namespace Prefix:	amgp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents percentage of third party out of pocket cost reimbursement.

+ References

No definition available.

+ Details

Name:	amgp_ThirdPartyOutOfPocketCostsReimbursementPercentage
Namespace Prefix:	amgp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TypeOfArrangementAxis=amgp_GatheringAndCompressionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=amgp_WaterServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: