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Schedule I - Condensed Financial Information of Parent Company - Balance Sheets (Parenthetical) (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Condensed Financial Statements, Captions [Line Items] |  |
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized | 120,000,000 | 120,000,000
Common stock, shares issued | 79,653,624 | 79,653,624
Common stock, shares outstanding | 79,653,624 | 79,653,624
PNM Resources |  |
Condensed Financial Statements, Captions [Line Items] |  |
Accumulated depreciation | $ 13,518 | $ 13,229
Common stock, no par value (in dollars per share) | $ 0 | $ 0
Common stock, shares authorized | 120,000,000 | 120,000,000
Common stock, shares issued | 79,653,624 | 79,653,624
Common stock, shares outstanding | 79,653,624 | 79,653,624

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