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Fair Value of Derivative and Other Financial Instruments - Derivative Balance Sheet Information (Details) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | $ 6,144,000 | $ 11,232,000
Commodity derivative instruments, Deferred charges | 3,369,000 | 0
Commodity derivative instruments, Current liabilities | (984,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | (477,000)
Current assets | 407,985,000 | 432,817,000
Current liabilities | 518,587,000 | 704,282,000
PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Amounts recognized for the right to reclaim cash collateral | 0 | 0
Amounts posted as cash collateral under margin arrangements | 1,200,000 | 3,800,000
Obligations to return cash collateral | 100,000 | 200,000
Fair Value Hedging [Member] | Commodity Contract [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 6,144,000 | 11,232,000
Commodity derivative instruments, Deferred charges | 3,369,000 | 0
Commodity derivative instruments, Assets | 9,513,000 | 11,232,000
Commodity derivative instruments, Current liabilities | (984,000) | (1,209,000)
Commodity derivative instruments, Long-term liabilities | 0 | (477,000)
Commodity derivative instruments, Liabilities | (984,000) | (1,686,000)
Commodity derivative instruments, Net | 8,529,000 | 9,546,000
Fair Value Hedging [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current assets | 300,000 | 0
Fair Value Hedging [Member] | Commodity Contract [Member] | Fuel and Purchased Power Adjustment Clause [Member] | Public Service Company of New Mexico [Member] | Maximum [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Current liabilities | 100,000 |
Fair Value Hedging [Member] | Commodity Contract [Member] | Palo Verde Nuclear Generating Station [Member] | PNMR and PNM [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Commodity derivative instruments, Current assets | 2,200,000 | $ 3,000,000
Commodity derivative instruments, Deferred charges | $ 3,400,000 |

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