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Income Taxes - Schedule of Deferred Income Tax Components (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | $ 70,338 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (12,424) |  |
Amortization of excess deferred income tax | (24,484) |  |
Tax effect of mark-to-market adjustments | 2,729 |  |
Tax effect of excess pension liability | (5,196) |  |
Adjustment for uncertain income tax positions | 562 |  |
Reclassification of unrecognized tax benefits | (562) |  |
Other | (216) |  |
Deferred income taxes | 30,747 | $ 20,405 | $ (25,385)
Public Service Company of New Mexico |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 51,532 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (9,834) |  |
Amortization of excess deferred income tax | (15,158) |  |
Tax effect of mark-to-market adjustments | 2,957 |  |
Tax effect of excess pension liability | (5,196) |  |
Adjustment for uncertain income tax positions | 541 |  |
Reclassification of unrecognized tax benefits | 2,278 |  |
Deferred income taxes | 27,120 | 22,442 | (20,145)
Texas-New Mexico Power Company |  |  |
Income Taxes [Line Items] |  |  |
Net change in deferred income tax liability per above table | 11,879 |  |
Change in tax effects of income tax related regulatory assets and liabilities | (2,591) |  |
Amortization of excess deferred income tax | (9,326) |  |
Other | (215) |  |
Deferred income taxes | $ (253) | $ (7,773) | $ (7,650)

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