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Income Taxes - Accumulated Accrued Interest Receivable (Payable) Related to Income Taxes (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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PNMR [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | $ 0 | $ 3,236
Accumulated accrued interest payable | 0 | (1,120)
Public Service Company of New Mexico [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | 0 | 3,236
Accumulated accrued interest payable | 0 | (24)
Texas-New Mexico Power Company [Member] |  |
Income Taxes [Line Items] |  |
Accumulated accrued interest receivable | 0 | 0
Accumulated accrued interest payable | $ 0 | $ (120)

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- Definition Income Taxes [Line Items] + References No definition available. + Details
Name: | pnm_IncomeTaxesLineItems
Namespace Prefix: | pnm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Unrecognized Tax Benefit, Accumulated Accrued Interest Payable + References No definition available. + Details
Name: | pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestPayable
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecognized Tax Benefit, Accumulated Accrued Interest Receivable + References No definition available. + Details
Name: | pnm_UnrecognizedTaxBenefitAccumulatedAccruedInterestReceivable
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=pnm_PnmrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=pnm_PublicServiceCompanyOfNewMexicoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |