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Fair Value of Derivative and Other Financial Instruments - Items not Recorded at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
PNMR [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | $ 2,264,869 | $ 2,173,117
Investment in PVNGS lessor notes | 8,947 | 32,836
Other investments | 1,269 | 2,375
PNMR [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 2,091,948 | 1,962,385
Investment in PVNGS lessor notes | 8,587 | 31,232
Other investments | 604 | 1,762
PNMR [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Investment in PVNGS lessor notes | 0 | 0
Other investments | 604 | 639
PNMR [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 2,264,869 | 2,173,117
Investment in PVNGS lessor notes | 0 | 0
Other investments | 0 | 0
PNMR [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Investment in PVNGS lessor notes | 8,947 | 32,836
Other investments | 665 | 1,736
Public Service Company of New Mexico [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,703,209 | 1,624,222
Investment in PVNGS lessor notes | 8,947 | 32,836
Other investments | 366 | 397
Public Service Company of New Mexico [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,580,677 | 1,482,537
Investment in PVNGS lessor notes | 8,587 | 31,232
Other investments | 366 | 397
Public Service Company of New Mexico [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Investment in PVNGS lessor notes | 0 | 0
Other investments | 366 | 397
Public Service Company of New Mexico [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 1,703,209 | 1,624,222
Investment in PVNGS lessor notes | 0 | 0
Other investments | 0 | 0
Public Service Company of New Mexico [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Investment in PVNGS lessor notes | 8,947 | 32,836
Other investments | 0 | 0
Texas-New Mexico Power Company [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 411,661 | 427,356
Other investments | 238 | 242
Texas-New Mexico Power Company [Member] | Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 361,411 | 361,241
Other investments | 238 | 242
Texas-New Mexico Power Company [Member] | Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Other investments | 238 | 242
Texas-New Mexico Power Company [Member] | Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 411,661 | 427,356
Other investments | 0 | 0
Texas-New Mexico Power Company [Member] | Level 3 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt | 0 | 0
Other investments | $ 0 | $ 0

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