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Pension and Other Postretirement Benefits Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Retirement Plans, 401 (k) plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Expenses recognized | $ 16,703us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember | $ 16,785us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember | $ 16,185us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember
Other Retirement Plans, 401 (k) plan [Member] | Public Service Company of New Mexico [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Expenses recognized | 12,745us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 12,952us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 12,427us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other Retirement Plans, 401 (k) plan [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Expenses recognized | 3,958us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 3,953us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | 3,739us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlans401KPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember
Other Retirement Plans, Key Employees, Non-qualified Plan [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Compensation expense | 2,257us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember | 2,204us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember | 1,491us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember
Other Retirement Plans, Key Employees, Non-qualified Plan [Member] | Public Service Company of New Mexico [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Compensation expense | 1,722us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,691us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember | 1,143us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_PublicServiceCompanyOfNewMexicoMember
Other Retirement Plans, Key Employees, Non-qualified Plan [Member] | Texas-New Mexico Power Company [Member] |  |  |
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |  |  |
Compensation expense | $ 535us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 513us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember | $ 327us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedContributionPlanTypeAxis = pnm_OtherRetirementPlansKeyEmployeesNonQualifiedPlanMember / dei_LegalEntityAxis = pnm_TexasNewMexicoPowerCompanyMember

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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