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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Equity [Abstract] |  |
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process | 22.80%pnm_PercentageofPensionLiabilityAdjustmentCapitalizedintoConstructionWorkInProcess | 23.20%pnm_PercentageofPensionLiabilityAdjustmentCapitalizedintoConstructionWorkInProcess
Percentage of Pension Liability Adjustment Capitalized into Other Accounts | 2.90%pnm_PercentageOfPensionLiabilityAdjustmentCapitalizedIntoOtherAccounts | 2.70%pnm_PercentageOfPensionLiabilityAdjustmentCapitalizedIntoOtherAccounts
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | $ (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Net change after income taxes | 2,525 us-gaap_OtherComprehensiveIncomeLossNetOfTax | 791 us-gaap_OtherComprehensiveIncomeLossNetOfTax
Ending Balance | (59,230)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
PNMR and PNM [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | 28,008 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 25,748 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Amounts reclassified from AOCI (pre-tax) | (4,172)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (3,255)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Income tax impact of amounts reclassified | 1,635 pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 1,283 pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Other OCI changes (pre-tax) | 6,836 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 3,379 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Income tax impact of other OCI changes | (2,679)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | (1,332)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Net change after income taxes | 1,620 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 75 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
Ending Balance | 29,628 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember | 25,823 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember
PNMR and PNM [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | (89,763)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (83,625)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Amounts reclassified from AOCI (pre-tax) | 1,488 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 1,288 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Income tax impact of amounts reclassified | (583)pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (508)pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Net change after income taxes | 905 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | 780 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
Ending Balance | (88,858)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | (82,845)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrAndPnmMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
PNM [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmMember | (57,877)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmMember
Amounts reclassified from AOCI (pre-tax) | (2,684)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmMember | (1,967)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmMember
Income tax impact of amounts reclassified | 1,052 pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmMember | 775 pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmMember
Other OCI changes (pre-tax) | 6,836 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PnmMember | 3,379 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PnmMember
Income tax impact of other OCI changes | (2,679)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PnmMember | (1,332)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PnmMember
Net change after income taxes | 2,525 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmMember | 855 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmMember
Ending Balance | (59,230)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmMember | (57,022)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmMember
Texas-New Mexico Power Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance |  | (263)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Amounts reclassified from AOCI (pre-tax) |  | 55 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Income tax impact of amounts reclassified |  | (19)pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Other OCI changes (pre-tax) |  | (153)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Income tax impact of other OCI changes |  | 53 us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Net change after income taxes |  | (64)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Ending Balance |  | (327)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PNMRandTNMPMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
PNMR [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |
Beginning Balance | (61,755)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrMember | (58,140)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrMember
Amounts reclassified from AOCI (pre-tax) | (2,684)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmrMember | (1,912)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax / dei_LegalEntityAxis = pnm_PnmrMember
Income tax impact of amounts reclassified | 1,052 pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmrMember | 756 pnm_IncomeTaxImpactOfAmountsReclassifiedFromAccumulatedOtherComprehensiveIncome / dei_LegalEntityAxis = pnm_PnmrMember
Other OCI changes (pre-tax) | 6,836 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PnmrMember | 3,226 us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax / dei_LegalEntityAxis = pnm_PnmrMember
Income tax impact of other OCI changes | (2,679)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PnmrMember | (1,279)us-gaap_OtherComprehensiveIncomeLossTax / dei_LegalEntityAxis = pnm_PnmrMember
Net change after income taxes | 2,525 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrMember | 791 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrMember
Ending Balance | $ (59,230)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrMember | $ (57,349)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = pnm_PnmrMember

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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