Represents the area of dedication.

No definition available.

Name:	ar_AcreageOfAreaOfDedication
Namespace Prefix:	ar_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the area of low pressure pipeline systems and gathering rights sold by the entity during the period.

+ References

No definition available.

+ Details

Name:	ar_DisposalGroupsIncludingDiscontinuedOperationsAreaOfLowPressurePipelineSystemsAndGatheringRightsSold
Namespace Prefix:	ar_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of potential cash receipts that could result from the contingent consideration arrangements.

+ References

No definition available.

+ Details

Name:	ar_DisposalGroupsIncludingDiscontinuedOperationsContingentConsiderationPotentialCashReceipts
Namespace Prefix:	ar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the period for which the entity is committed to deliver minimum volumes into gathering systems.

+ References

No definition available.

+ Details

Name:	ar_DisposalGroupsIncludingDiscontinuedOperationsPeriodForCommitmentToDeliverMinimumVolumesIntoGatheringSystems
Namespace Prefix:	ar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period of exclusive rights to gather gas within the area of dedication.

+ References

No definition available.

+ Details

Name:	ar_DisposalGroupsIncludingDiscontinuedOperationsPeriodOfExclusiveRightsToGatherGasWithinAreaOfDedication
Namespace Prefix:	ar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the purchase price associated with the divestiture.

+ References

No definition available.

+ Details

Name:	ar_PurchasePriceOfDivestiture
Namespace Prefix:	ar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Area of land held.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfLand
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

No definition available.

+ Details

Name:	us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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

Sale of Appalachian Gathering Assets (Details) (Appalachian Gathering Assets, USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Mar. 31, 2012 mi acre	Dec. 31, 2014	Mar. 26, 2012 acre
Sale of Assets
Period of exclusive rights to gather the gas within AOD	20 years
Purchase Price	$ 375ar_PurchasePriceOfDivestiture
Area of low pressure pipeline systems and gathering rights sold (in miles)	25
Area of land held (in acres)			104,000us-gaap_AreaOfLand
Area of AOD (in acres)	250,000ar_AcreageOfAreaOfDedication
Period for which entity is committed to deliver minimum annual volumes into gathering systems, with certain carryback and carryforward adjustments for overages or deficiencies		7 years
Gain recognized on the sale of assets	291	40
Maximum
Sale of Assets
Additional sale proceeds on meeting certain volume threshold			40