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Goodwill and Other Intangible Assets; Impairments (Details) (USD $) |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Customer Lists [Member] | Dec. 31, 2008 Customer Lists [Member] | Dec. 31, 2008 Trade Names [Member] | Dec. 31, 2008 Texas-New Mexico Power Company [Member] | Dec. 31, 2013 Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Apr. 02, 2012 Texas-New Mexico Power Company [Member] | Dec. 31, 2008 Public Service Company of New Mexico [Member] | Dec. 31, 2013 Public Service Company of New Mexico [Member] | Apr. 03, 2013 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Apr. 02, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2008 First Choice [Member]
Schedule of Goodwill and Other Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 278,297,000 | $ 278,297,000 | $ 278,297,000 |  |  |  |  | $ 226,665,000 | $ 226,665,000 |  |  | $ 51,632,000 |  | $ 51,632,000 |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  |  |  |  |  |  |  |  |  | 26.00% |  |  | 27.00% |  | 15.00% |
Goodwill, Reporting Unit, Sensitivity analysis, Percentage Increase in Expected Return on Equity |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |
Goodwill, Reporting Unit, Sensitivity analysis, Reduced Percentage of Fair Value in Excess of Carrying Value |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | 34,500,000 |  |  |  | 51,100,000 |  |  |  |  | 88,800,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  |  |  |  |  | 42,600,000 |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  | $ 4,800,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Goodwill, Reporting Unit, Sensitivity analysis, Reduced Percentage of Fair Value in Excess of Carrying Value + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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