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Capitalization, Financing Activities and Convertible Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  | 9 Months Ended
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Sep. 23, 2011 Series A Convertible Preferred Stock [Member] | Apr. 30, 2012 Public Service Company of New Mexico [Member] | Sep. 30, 2012 Pollution Control Revenue Bonds [Member] 2.54% Maturing of September 1, 2042 with a Mandatory Tender on June 1, 2017 [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Pollution Control Revenue Bonds [Member] 5.15% Maturing in 2037 [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 New Mexico Public Regulation Commission [Member] Public Service Company of New Mexico [Member] Extensions
Class of Stock [Line Items] |  |  |  |  |
Debt Instrument, Requested Approval to Refinance Debt |  | $ 20.0 |  |  |
Number of Extension Options Received Authority To Exercise |  |  |  |  | 2
Extension Option Granted Authority To Exercise, Years |  |  |  |  | 1 year
Debt Instrument, Face Amount |  |  | 20.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.54% | 5.15% |
Debt Instrument, Refunded Amount Redeemed at Par and Retired |  |  |  | $ 20.0 |
Preferred Stock, Agreement to purchase all outstanding shares related to convertible preferred stock | 477,800 |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 10 |  |  |  |

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- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 + Details
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