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Other Income and Other Expense (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Other income: |  |
Interest income | $ 110 us-gaap_InvestmentIncomeInterest | $ 251 us-gaap_InvestmentIncomeInterest
Miscellaneous | 125 pnw_MiscellaneousOtherNonoperatingIncome | 2,116 pnw_MiscellaneousOtherNonoperatingIncome
Total other income | 235 us-gaap_OtherNonoperatingIncome | 2,367 us-gaap_OtherNonoperatingIncome
Other expense: |  |
Non-operating costs | (2,249)pnw_NonoperatingCosts | (2,372)pnw_NonoperatingCosts
Investment losses — net | (495)us-gaap_LossOnSaleOfInvestments | (140)us-gaap_LossOnSaleOfInvestments
Miscellaneous | (1,542)pnw_MiscellaneousOtherNonoperatingExpense | (2,172)pnw_MiscellaneousOtherNonoperatingExpense
Total other expense | (4,286)us-gaap_OtherNonoperatingExpense | (4,684)us-gaap_OtherNonoperatingExpense
Arizona Public Service Company |  |
Other income: |  |
Interest income | 67 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 138 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Miscellaneous | 572 pnw_MiscellaneousOtherNonoperatingIncome / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 2,624 pnw_MiscellaneousOtherNonoperatingIncome / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total other income | 639 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | 2,762 us-gaap_OtherNonoperatingIncome / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Other expense: |  |
Non-operating costs | (2,517)pnw_NonoperatingCosts / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (2,587)pnw_NonoperatingCosts / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Asset dispositions | (643)us-gaap_GainLossOnDispositionOfAssets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (183)us-gaap_GainLossOnDispositionOfAssets / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Miscellaneous | (2,194)pnw_MiscellaneousOtherNonoperatingExpense / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | (2,286)pnw_MiscellaneousOtherNonoperatingExpense / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember
Total other expense | $ (5,354)us-gaap_OtherNonoperatingExpense / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember | $ (5,056)us-gaap_OtherNonoperatingExpense / dei_LegalEntityAxis = pnw_ArizonaPublicServiceCompanyMember

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- Definition Amount of miscellaneous other nonoperating expenses resulting from ancillary business-related activities (that is, excluding major activities considered as a part of the normal operations of the business). + References No definition available. + Details
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- Definition Amount of miscellaneous other nonoperating income resulting from ancillary business-related activities (that is, excluding major activities considered as a part of the normal operations of the business). + References No definition available. + Details
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- Definition Amount of nonoperating costs resulting from the ancillary business-related activities (that is, excluding major activities considered as a part of the normal operations of the business) recognized during the period. + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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