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Consolidated Variable Interest Entities - Statements of Operations and Cash Flows (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Variable Interest Entity [Line Items] |  |
Operating revenues | $ 203,426 | $ 185,786
Operating expenses | 59,525 | 49,623
Other expenses | 1,913 | 384
Net income | 141,988 | 135,779
Net cash provided by operating activities | 160,769 | 115,644
Net cash used in investing activities | (81,687) | (123,522)
Net cash used in financing activities | $ (96,767) | $ (352,704)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=64801991&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=64801991&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: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |