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Commitments and Contingencies - Nuclear Spent Fuel and Waste Disposal (Details) - Palo Verde Nuclear Generating Station [Member] - Public Service Company of New Mexico [Member] - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |
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Oct. 07, 2014 | May. 16, 2014 | Mar. 31, 2015 | Sep. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Nuclear Spent Fuel And Waste Disposal [Member] |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  | $ 58,000,000 |  |  |
Revised annual fee, nuclear waste disposal |  | $ 0 |  |  |  |  |
Nuclear Spent Fuel And Waste Disposal [Member] | Other Deferred Credits [Member] |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Loss contingency accrual |  |  |  | 12,000,000 |  |  | $ 12,300,000
Nuclear Spent Fuel And Waste Disposal [Member] | Settled Litigation [Member] |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Lawsuit settlement, third party receipt | $ 57,400,000 |  |  |  |  |  |
PNMs share of lawsuit settlement, third party receipt | $ 5,900,000 |  |  |  |  |  |
Department of energy, spent nuclear fuel removal July 2011 - June 2014 [Member] |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Lawsuit settlement, third party receipt |  |  | $ 42,000,000 |  |  |  |
PNMs share of third party settlement claim |  |  | $ 4,300,000 |  | $ 4,300,000 |  |
Litigation settlement, portion credited to customers |  |  |  |  | $ 3,100,000 |  |
Department of energy, spent nuclear fuel removal July 2014 - June 2015 [Member] |  |  |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
PNMs share of third party settlement claim |  |  |  |  |  | $ 1,300,000 |
Litigation settlement, portion credited to customers |  |  |  | 500,000 |  |  |
Anticipated claim settlement request, third party |  |  |  | $ 12,300,000 |  |  |

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