Represents the increase in oil and gas properties as a result of the ANPI transaction.

Name:	eqt_DerecognitionIncreaseInOilAndGasProperties
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the post-revaluation amount of equity investments prior to the derecognition as a result of the ANPI transaction.

+ Details

Name:	eqt_DerecognitionOfPostRevaluationOfEquityInvestment
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net increase in liabilities as a result of the ANPI transaction.

+ Details

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Namespace Prefix:	eqt
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the liability recognized for the discounted sales as a result of the ANPI transaction.

+ Details

Name:	eqt_LiabilityForDiscountedSales
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ Details

Name:	eqt_LongTermDebtFairValue
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the percentage of net profits received from sale of natural gas and oil from natural gas producing properties.

+ Details

Name:	eqt_PercentageOfNetProfitsReceivableForNetProfitsInterests
Namespace Prefix:	eqt
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the derivative liability recognized for the swap as a result of the ANPI transaction.

+ Details

Name:	eqt_RecognitionOfSwapDerivativeLiability
Namespace Prefix:	eqt
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of noncash consideration given by the acquirer to acquire the entity. Does not include cash paid, the fair value of debt and securities issued and liabilities incurred to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph d

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period Type:	duration

- Definition

In a business combination achieved in stages, this element represents the amount of gain or loss recognized by the entity as a result of re measuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 48

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph q(2)

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20

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Balance Type:	credit
Period Type:	instant

- Definition

Interest rate stated in the contractual 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

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Data Type:	us-types:percentItemType
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 18
-Subparagraph f

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 20
-Subparagraph a (1)

+ Details

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Acquisitions (Details) (USD $)			6 Months Ended
Acquisitions (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 Appalachian Natural Gas Trust	Dec. 31, 2000 Appalachian Natural Gas Trust	May 31, 2011 Class A interest	Jun. 30, 2011 7.76% notes, due 2011 thru 2016
Acquisitions
Proceeds from sale of net profits interest (NPI) in certain producing properties				$ 298,000,000
Ownership percentage (as a percent)					100.00%
Percentage of net profits received by ANGT (as a percent)				100.00%
Debt instrument, stated interest rate percentage (as a percent)						7.76%
Aggregate principal amount						57,141,000
Fair value of notes	2,000,000,000	2,000,000,000				64,200,000
Gain on revaluation of existing equity investment in aquiree			10,100,000
Derecognition of post revaluation of equity investment in ANGT			48,000,000
Derecognition of post revaluation of oil and gas properties			140,600,000
Recognition of a derivative liability for swap			12,700,000
Liability for discounted sales			16,400,000
Net increase in liabilities			$ 92,600,000