Represents the issue price of the debt instrument as a percentage of its face value.

No definition available.

Name:	ar_DebtInstrumentIssuePriceAsPercentageOfFaceValue
Namespace Prefix:	ar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount plus accrued interest of debt redeemed.

+ References

No definition available.

+ Details

Name:	ar_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountAndAccruedInterestRedeemed
Namespace Prefix:	ar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be repurchased in the event of a change of control.

+ References

No definition available.

+ Details

Name:	ar_DebtInstrumentRedemptionPriceUponChangeOfControlAsPercentageOfPrincipalAmount
Namespace Prefix:	ar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the borrowing base under the credit facility.

+ References

No definition available.

+ Details

Name:	ar_LineOfCreditFacilityBorrowingBase
Namespace Prefix:	ar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be redeemed in the event of a change of control.

+ References

No definition available.

+ Details

Name:	ar_LongTermDebtRedemptionPriceDueToChangeOfControlAsPercentageOfPrincipalAmount
Namespace Prefix:	ar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the redemption price as a percentage of the principal amount at which the debt instruments may be redeemed with net proceeds of certain equity offerings.

+ References

No definition available.

+ Details

Name:	ar_LongTermDebtRedemptionPriceWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
Namespace Prefix:	ar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of the aggregate principal amount of debt instruments that may be redeemed with net proceeds of certain equity offerings.

+ References

No definition available.

+ Details

Name:	ar_LongTermDebtRedemptionWithNetProceedsFromEquityOfferingsAsPercentageOfPrincipalAmount
Namespace Prefix:	ar_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 50

-Section 40

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629

+ Details

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

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of long-term debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_LongTermNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_NotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ar_MidstreamCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ar_SeniorNotes5.375PercentDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ar_SeniorNotes5125PercentDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ar_SeniorNotes6.00PercentDue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ar_SeniorNotes7.25PercentDue2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=ar_UnamortizedDiscountPremiumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_WaterDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt (Detail) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended
Long-Term Debt (Detail) (USD $)	Sep. 18, 2014	Dec. 31, 2014	Dec. 31, 2013	May 23, 2014	Feb. 04, 2013	Feb. 17, 2015	Nov. 19, 2012	Nov. 05, 2013	May 06, 2014
Long- term Debt
Notes Payable, Total		$ 4,362,550,000us-gaap_NotesPayable	$ 2,078,999,000us-gaap_NotesPayable
Notes Payable, Noncurrent		4,362,550,000us-gaap_LongTermNotesPayable	2,078,999,000us-gaap_LongTermNotesPayable
Senior notes issued	500,000,000us-gaap_DebtInstrumentFaceAmount
Issue price as percentage of par value	100.50%
Loss on Early Extinguishment of Debt		20,386,000	42,567,000
Subsequent event
Long- term Debt
Lender commitments						4,000,000,000
Fresh Water Distribution \| Subsequent event
Long- term Debt
Lender commitments						200,000,000
Midstream Credit Facility
Long- term Debt
Maximum amount of the Credit Facility		1,000,000,000
Midstream Credit Facility \| Minimum
Long- term Debt
Commitment fees on the unused portion (as a percent)		0.25%
Midstream Credit Facility \| Maximum
Long- term Debt
Commitment fees on the unused portion (as a percent)		0.375%
Bank credit facility
Long- term Debt
Notes Payable, Total		1,730,000,000	288,000,000
Maximum amount of the Credit Facility		4,000,000,000
Current borrowing base		4,000,000,000
Lender commitments		3,000,000,000
Outstanding balance			288,000,000
Weighted average interest rate (as a percent)			1.61%
Outstanding letters of credit			32,000,000
Bank credit facility \| Fresh Water Distribution
Long- term Debt
Current borrowing base		500,000,000
Lender commitments		200,000,000
Outstanding balance		1,730,000,000
Weighted average interest rate (as a percent)		2.06%
Outstanding letters of credit		387,000,000
Bank credit facility \| Fresh Water Distribution \| Minimum
Long- term Debt
Commitment fees on the unused portion (as a percent)		0.375%
Bank credit facility \| Fresh Water Distribution \| Maximum
Long- term Debt
Commitment fees on the unused portion (as a percent)		0.50%
7.25% senior notes due 2019
Long- term Debt
Notes Payable, Total			260,000,000
Interest rate (as a percent)				7.25%
Percentage of the principal amount of the 2021 notes, plus accrued interest of the debt instrument redeemed				100.00%
Loss on Early Extinguishment of Debt				17,400,000
Deferred financing costs charged to Loss on Early Extinguishment of Debt				3,000,000
Senior notes redeemed				260,000,000
6.00% senior notes due 2020
Long- term Debt
Notes Payable, Total		525,000,000	525,000,000
Interest rate (as a percent)			6.00%
Senior notes issued					225,000,000		300,000,000
Issue price as percentage of par value					103.00%
6.00% senior notes due 2020 \| On or after December 1, 2015
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)			104.50%
6.00% senior notes due 2020 \| On or after December 1, 2018
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)			100.00%
6.00% senior notes due 2020 \| On or before December 1, 2015
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)			100.00%
Redemption price of the debt instrument if redeemed with the proceeds of certain equity offerings (as a percent)			106.00%
6.00% senior notes due 2020 \| Prior to January 1, 2014
Long- term Debt
Percentage of principal amount at which notes may be required to be repurchased in event of change of control			101.00%
6.00% senior notes due 2020 \| Maximum \| On or before December 1, 2015
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%
5.375% senior notes due 2021
Long- term Debt
Notes Payable, Total		1,000,000,000	1,000,000,000
Interest rate (as a percent)								5.375%
Senior notes issued								1,000,000,000
5.375% senior notes due 2021 \| On or after November 1, 2016
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)		104.031%
5.375% senior notes due 2021 \| On or after November 1, 2019
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)		100.00%
5.375% senior notes due 2021 \| Prior to November 1, 2016
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)		100.00%
5.375% senior notes due 2021 \| On or before November 1, 2016
Long- term Debt
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 2021 \| Prior to May 1, 2015
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)		110.00%
Percentage of principal amount at which notes may be required to be repurchased in event of change of control		101.00%
5.375% senior notes due 2021 \| Maximum \| On or before November 1, 2016
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%
Net unamortized premium
Long- term Debt
Notes Payable, Total		7,550,000	5,999,000
Stand-alone revolving note
Long- term Debt
Maximum amount of the Credit Facility			25,000,000
Outstanding balance			0
Description of variable rate basis		lender's prime rate
Basis spread on variable rate (as a percent)			1.00%
5.125 senior notes due 2022
Long- term Debt
Notes Payable, Total		1,100,000,000
Interest rate (as a percent)									5.125%
Senior notes issued									$ 600,000,000
5.125 senior notes due 2022 \| On or after June 1, 2017
Long- term Debt
Percentage of the principal amount of the debt instrument redeemed		103.844%
5.125 senior notes due 2022 \| On or before June 1, 2017
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)		105.125%
5.125 senior notes due 2022 \| On or after June 1, 2020
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)		100.00%
Percentage of the principal amount of the debt instrument redeemed		100.00%
5.125 senior notes due 2022 \| Prior to December 1, 2015
Long- term Debt
Redemption price of the debt instrument in the event of change of control (as a percent)		110.00%
Percentage of principal amount at which notes may be required to be repurchased in event of change of control		101.00%