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Stockholders' Equity (Details) (USD $) | 0 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2011 | Sep. 23, 2011 | Sep. 23, 2011 Series A convertible preferred stock [Member] | Dec. 31, 2012 Public Service Company of New Mexico [Member] | Dec. 31, 2011 Public Service Company of New Mexico [Member] | Dec. 31, 2010 Public Service Company of New Mexico [Member] | Dec. 31, 2012 Texas-New Mexico Power Company [Member] | Jan. 31, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2010 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2012 Affiliated Entity [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2011 Affiliated Entity [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2010 Affiliated Entity [Member] Texas-New Mexico Power Company [Member] | Dec. 31, 2012 Line of Credit [Member] Texas-New Mexico Power Company [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity contribution from parent |  |  |  | $ 0 | $ 43,000,000 | $ 0 |  |  |  |  |  |  |  |  |
Cash dividends paid to parent company by consolidated subsidiaries |  |  |  |  |  |  |  | 39,100,000 | 34,400,000 | 8,200,000 | 28,000,000 | 26,000,000 | 13,700,000 | 13,100,000 |
Ratio of debt to capital, maximum (as a percent) | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00%
Amount available for dividend distribution without prior approval from regulators or financial counterparties |  |  |  | $ 208,000,000 |  |  | $ 181,000,000 |  |  |  |  |  |  |  |
Agreement to purchase all outstanding shares related to Series A convertible preferred stock (in shares) |  |  | 477,800 |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  | 4,778,000 | 10 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate (as a percent) |  |  |  | 4.58% |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption percent (as a percent) |  |  |  | 102.00% |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 477,800 |  | 115,293 | 115,293 |  |  |  |  |  |  |  |  |  |
Preferred stock, cumulative shares authorized (in shares) |  |  |  | 10,000,000 | 10,000,000 |  | 1,000,000 |  |  |  |  |  |  |  |

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