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Schedule I - Condensed Financial Information of Parent Company - Balance Sheets (Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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 $ 13,229 $ 12,291
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