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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Variable Interest Entity [Line Items] |  |  |  |
Operating revenues | $ 172,004 | $ 144,613 | $ 352,605 | $ 299,424
Operating expenses | (48,483) | (44,255) | (97,855) | (86,314)
Other income (expenses) | 469 | (15,513) | (2,651) | (46,590)
Net income | 123,990 | 84,845 | 252,099 | 166,520
Net cash provided by operating activities | 149,855 | 124,443 | 267,426 | 239,102
Net cash used in investing activities | (200,284) | (233,448) | (303,958) | (765,883)
Net cash provided by (used in) financing activities | $ 134,410 | $ (101,601) | $ (229,927) | $ 356,500

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

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- Details
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