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Commitments and Contingencies - Coal Supply (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2016 | Dec. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Apr. 28, 2016
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Other current assets |  | $ 82,104,000 | $ 96,936,000 |  |
Regulatory disallowances and restructuring costs |  |  | 774,000 | $ 215,000 |
Public Service Company of New Mexico [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Other current assets |  | 74,990,000 | 91,541,000 |  |
Regulatory disallowances and restructuring costs |  |  | 774,000 | $ 215,000 |
Public Service Company of New Mexico [Member] | Mine Reclamation Trust [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Required contribution to Reclamation Trust, current fiscal year |  |  | 4,000,000 |  |
Required contribution to Reclamation Trust, next fiscal year |  |  | 4,700,000 |  |
Public Service Company of New Mexico [Member] | Mine Reclamation Trust [Member] | Four Corners [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Required contribution to Reclamation Trust, next fiscal year |  |  | 1,900,000 |  |
Anticipated funding to Reclamation Trust, next fiscal year |  |  | 2,000,000 |  |
Anticipated funding to Reclamation Trust, third fiscal year |  |  | 2,100,000 |  |
Public Service Company of New Mexico [Member] | Surface [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Regulatory assets |  |  | 100,000,000 |  |
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Surface [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  | 38,800,000 | 38,700,000 |  |
Final reclamation, capped amount to be collected |  |  | 100,000,000 |  |
Public Service Company of New Mexico [Member] | Loss on Long-term Purchase Commitment [Member] | Underground [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency accrual |  | 11,400,000 | 11,700,000 |  |
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member] | Loss on Long-term Purchase Commitment [Member] | Surface [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Regulatory disallowances and restructuring costs |  | 16,500,000 |  |  |
Loss contingency, estimate of possible loss |  |  | 97,600,000 |  |
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member] | Loss on Long-term Purchase Commitment [Member] | Underground [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Loss contingency, estimate of possible loss |  |  | 118,900,000 |  |
Public Service Company of New Mexico [Member] | San Juan Generating Station [Member] | Coal Supply [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Other current assets |  | $ 49,000,000 | $ 65,200,000 |  |
Estimated increase in coal cost |  |  | 40.00% |  |
NM Capital [Member] | BTMU Term Loan Agreement [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Term loans | $ 125,000,000.0 |  |  |  |
NM Capital [Member] | San Juan Generating Station [Member] | Coal Supply [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Payments to fund long-term loans to unaffiliated third party |  |  | $ 125,000,000.0 |  |
Loan agreement among several entities | $ 125,000,000 |  |  |  |
Initial interest rate | 7.25% |  |  |  |
Requirement to post reclamation bonds | $ 161,600,000 |  |  |  |
Cash used to support bank letter or credit arrangement | $ 40,000,000 |  |  |  |
Number of days to provide security interest | 180 days |  |  |  |
Subsequent Event [Member] | NM Capital [Member] | San Juan Generating Station [Member] | Coal Supply [Member] |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Requirement to post reclamation bonds |  |  |  |  | $ 118,700,000

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