Discontinued Operations - Statement of Cash Flows (Details) - Midstream Business - Discontinued Operations, Disposed of by Means Other than Sale, Spinoff - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018
Operating activities:
Deferred income tax (benefit)		$ (105,107)
Depreciation	$ 45,963	91,163
Amortization of intangible assets	$ 10,387	20,773
Other income		(21,597)
Share-based compensation expense		$ 808

Disposal Group, Including Discontinued Operation, Amortization of Intangible Asset

No definition available.

Name:	eqt_DisposalGroupIncludingDiscontinuedOperationAmortizationofIntangibleAsset
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disposal Group, Including Discontinued Operation, Cash Flow from Operating Activities [Abstract]

+ References

No definition available.

+ Details

Name:	eqt_DisposalGroupIncludingDiscontinuedOperationCashFlowfromOperatingActivitiesAbstract
Namespace Prefix:	eqt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Disposal Group, Including Discontinued Operation, Increase (Decrease) in Deferred Income Taxes

+ References

No definition available.

+ Details

Name:	eqt_DisposalGroupIncludingDiscontinuedOperationIncreaseDecreaseinDeferredIncomeTaxes
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Disposal Group, Including Discontinued Operation, Share-based Compensation Expense

+ References

No definition available.

+ Details

Name:	eqt_DisposalGroupIncludingDiscontinuedOperationSharebasedCompensationExpense
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

+ Details

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

- Definition

Amount of other income attributable to disposal group, including, but not limited to, discontinued operation.

+ References

+ Details

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

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=eqt_MidstreamBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfByMeansOtherThanSaleSpinoffMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: