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Income Taxes Summary of Income Tax Contingencies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | $ (54,000) |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | (745,000) |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | 19,198,000 | 19,580,000 | 36,105,000
Additions based on tax positions |  | 2,046,000 | (790,000)
Reductions for tax positions of prior years |  | (2,428,000) | (15,735,000)
Settlements | 0 | 0 | 0
Unrecognized Tax Benefits - End | 19,889,000 | 19,198,000 | 19,580,000
PNMR [Member] |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 5,600,000 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 5,500,000 |  |
Public Service Company of New Mexico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | (54,000) |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | (745,000) |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | 10,382,000 | 10,752,000 | 11,918,000
Additions based on tax positions |  | 1,152,000 | (717,000)
Reductions for tax positions of prior years |  | (1,522,000) | (449,000)
Settlements | 0 | 0 | 0
Unrecognized Tax Benefits - End | 11,073,000 | 10,382,000 | 10,752,000
Unrecognized tax benefits that would impact effective tax rate | 1,400,000 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 400,000 |  |
Texas-New Mexico Power Company [Member] |  |  |
Income Taxes [Line Items] |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 0 |  |
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0 |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized Tax Benefits - Beginning | 6,796,000 | 7,701,000 | 7,788,000
Additions based on tax positions |  | 0 | (74,000)
Reductions for tax positions of prior years |  | (905,000) | (13,000)
Settlements | 0 | 0 | 0
Unrecognized Tax Benefits - End | 6,796,000 | 6,796,000 | 7,701,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | $ 6,800,000 |  |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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