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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Service billings [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 22,734 | $ 22,727
Service billings [Member] | PNMR to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 7,048 | 7,078
Service billings [Member] | PNM to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 106 | 92
Service billings [Member] | TNMP to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 10 | 10
Interest charges [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 6
Interest charges [Member] | PNMR to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 50 | 79
Interest charges [Member] | PNM to PNMR [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 36 | 29
Income tax sharing payments [Member] | PNMR to PNM [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | 0 | 0
Income tax sharing payments [Member] | PNMR to TNMP [Member] |  |
Related Party Transaction [Line Items] |  |
Amount of related party transaction | $ 0 | $ 0

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Details
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Data Type: | na
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