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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
NET INCOME | $ 20,727 us-gaap_ProfitLoss | $ 24,691 us-gaap_ProfitLoss
Derivative instruments: |  |
Net unrealized gain (loss), net of tax benefit (expense) | (800)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | (422)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of net realized loss, net of tax benefit | 1,976 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax | 3,116 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Pension and other postretirement benefits activity, net of tax benefit (expense) | 583 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 457 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total other comprehensive income | 1,759 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 3,151 us-gaap_OtherComprehensiveIncomeLossNetOfTax
COMPREHENSIVE INCOME | 22,486 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 27,842 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Less: Comprehensive income attributable to noncontrolling interests | 4,605 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 8,925 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | 17,881 us-gaap_ComprehensiveIncomeNetOfTax | 18,917 us-gaap_ComprehensiveIncomeNetOfTax
Arizona Public Service Company |  |
NET INCOME | 24,473 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 28,443 us-gaap_ProfitLoss / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Derivative instruments: |  |
Net unrealized gain (loss), net of tax benefit (expense) | (800)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (421)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Reclassification of net realized loss, net of tax benefit | 1,976 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 3,116 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Pension and other postretirement benefits activity, net of tax benefit (expense) | 681 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 566 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total other comprehensive income | 1,857 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 3,261 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
COMPREHENSIVE INCOME | 26,330 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 31,704 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Less: Comprehensive income attributable to noncontrolling interests | 4,605 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 8,925 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 21,725 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | $ 22,779 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember

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