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Consolidated Variable Interest Entities - Statements of Operations and Cash Flows (Details) - EQGP - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Variable Interest Entity [Line Items] |  |  |  |
Operating revenues | $ 364,584 | $ 207,193 | $ 1,110,307 | $ 609,585
Operating expenses | 133,665 | 62,230 | 370,880 | 180,218
Other (income) expenses | 23,534 | 2,556 | 37,632 | 6,418
Net income | 207,385 | 142,407 | 701,795 | 422,949
Net cash provided by operating activities | 422,938 | 159,911 | 863,009 | 479,566
Net cash used in investing activities | (575,624) | (117,637) | (2,252,293) | (324,936)
Net cash (used in) provided by financing activities | $ (536,246) | $ (48,128) | $ 1,340,446 | $ (208,150)

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- Definition Variable Interest Entity, Measure of Activity, Income or Loss, Net of Tax + References No definition available. + Details
Name: | eqt_VariableInterestEntityMeasureofActivityIncomeorLossNetofTax
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Variable Interest Entity, Measure of Activity, Net Cash Provided by (Used in) Financing Activities + References No definition available. + Details
Name: | eqt_VariableInterestEntityMeasureofActivityNetCashProvidedbyUsedinFinancingActivities
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Variable Interest Entity, Measure of Activity, Net Cash Provided by (Used in) Investing Activities + References No definition available. + Details
Name: | eqt_VariableInterestEntityMeasureofActivityNetCashProvidedbyUsedinInvestingActivities
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Variable Interest Entity, Measure of Activity, Net Cash Provided by (Used in) Operating Activities + References No definition available. + Details
Name: | eqt_VariableInterestEntityMeasureofActivityNetCashProvidedbyUsedinOperatingActivities
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Variable Interest Entity, Measure of Activity, Other Expenses (Income) + References No definition available. + Details
Name: | eqt_VariableInterestEntityMeasureofActivityOtherExpensesIncome
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of expense between the reporting entity and the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of income between the reporting entity and the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityActivityBetweenVIEAndEntityRevenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=eqt_EQTGPHoldingsLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |