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Income Taxes - Summary of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax [Line Items] |  |  |
Tax positions, that if recognized, would decrease our effective tax rate | $ 11,313 | $ 9,523 | $ 11,207
Unrecognized tax benefit interest expense/(benefit) recognized | 529 | (161) | 752
Unrecognized tax benefit interest accrued | 1,333 | 804 | 965
ARIZONA PUBLIC SERVICE COMPANY |  |  |
Income Tax [Line Items] |  |  |
Tax positions, that if recognized, would decrease our effective tax rate | 11,313 | 9,523 | 11,207
Unrecognized tax benefit interest expense/(benefit) recognized | 529 | (161) | 752
Unrecognized tax benefit interest accrued | $ 1,333 | $ 804 | $ 965

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- Definition [Line Items] for Income Tax [Table] + References No definition available. + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition Amount of interest expense for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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