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v2.4.1.9

Sale of First Choice (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on sale of First Choice | $ 0pnm_GainOnSaleOfBusinessSegment | $ 0pnm_GainOnSaleOfBusinessSegment | $ 1,012pnm_GainOnSaleOfBusinessSegment
Other Income [Member] | First Choice [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on sale of First Choice |  |  | $ 1,000pnm_GainOnSaleOfBusinessSegment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = pnm_FirstChoiceMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember

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- Definition Gain on Sale of Business Segment + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |