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Statements of Condensed Consolidated Equity (Unaudited) (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]    
Natural gas, tax (benefit) $ (27,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax $ (14,896)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Interest rate, tax 25eqt_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesInterestRateTax 25eqt_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesInterestRateTax
Pension and other post-retirement benefits liability adjustment, tax expense $ 128us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 114us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Dividends (in dollars per share) $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid $ 0.03us-gaap_CommonStockDividendsPerShareCashPaid
Distributions to noncontrolling interests (in dollars per common unit) $ 0.58us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.46us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit