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Optim Energy (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2010 | Dec. 31, 2010 Optim Energy [Member] | Sep. 30, 2010 Optim Energy [Member] | Sep. 30, 2011 Optim Energy [Member] | Sep. 30, 2010 Optim Energy [Member] | Sep. 23, 2011 Optim Energy [Member] | Sep. 22, 2011 Optim Energy [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 1.00% | 50.00%
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) |  |  |  |  |  |  | 7,600,000 |  | (6,800,000) |  |
PNMR equity in net earnings (loss) of Optim Energy | 0 | 2,495,000 | 0 | (5,714,000) |  |  | 2,500,000 | 0 | (5,700,000) |  |
Equity Method Investment Summarized Financial Information, Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
PNMR equity investment in Optim Energy |  |  |  |  |  | 0 |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  | $ 188,200,000 |  |  |  |  |

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