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Quarterly Operating Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Operating Revenues $ 359,276 $ 472,465 $ 357,649 $ 333,622 $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 1,523,012 $ 1,457,603 $ 1,436,613
Operating income (loss) 18,588 147,805 71,150 47,738 60,552 140,540 (93,615) 36,723 285,281 144,200 236,047
Net earnings (loss) 11,701 125,453 61,561 (11,399) 35,989 106,763 (72,283) 21,662 $ 187,316 $ 92,131 $ 101,282
Net Earnings Attributable to PNMR $ 8,778 $ 121,768 $ 57,489 $ (15,260) $ 31,805 $ 102,771 $ (75,914) $ 18,700      
Net Earnings Attributable to PNMR per Common Share:                      
Basic (in dollars per share) $ 0.11 $ 1.52 $ 0.72 $ (0.19) $ 0.40 $ 1.29 $ (0.95) $ 0.23 $ 2.16 $ 0.97 $ 1.07
Diluted (in dollars per share) $ 0.10 $ 1.52 $ 0.72 $ (0.19) $ 0.40 $ 1.28 $ (0.95) $ 0.23 $ 2.15 $ 0.97 $ 1.07
Income taxes (benefit)                 $ 20,636 $ (25,282) $ 7,775
Public Service Company of New Mexico                      
Segment Reporting Information [Line Items]                      
Operating Revenues $ 266,409 $ 364,504 $ 260,788 $ 248,133 $ 255,172 $ 331,113 $ 238,219 $ 269,318 1,139,834 1,093,822 1,091,965
Operating income (loss) 15,168 116,540 49,584 33,605 44,299 108,453 (115,977) 24,293 214,897 61,068 145,033
Net earnings (loss) 19,594 103,004 49,612 (12,196) 32,040 84,721 (83,313) 21,974 160,014 55,422 70,323
Net Earnings Attributable to PNMR 16,803 99,451 45,672 (15,925) 27,988 80,861 (86,812) 19,144 146,001 41,181 55,211
Net Earnings Attributable to PNMR per Common Share:                      
Income taxes (benefit)                 21,857 (25,962) (5,971)
Texas-New Mexico Power Company                      
Segment Reporting Information [Line Items]                      
Operating Revenues 92,867 107,961 96,861 85,489 88,972 102,473 92,009 80,327 383,178 363,781 344,648
Operating income (loss) 19,154 31,779 23,175 14,345 18,055 32,596 22,578 12,585 88,453 85,814 96,497
Net Earnings Attributable to PNMR 11,398 $ 23,921 $ 16,174 $ 7,092 11,347 $ 25,087 $ 15,267 $ 4,098 58,585 55,799 51,591
Net Earnings Attributable to PNMR per Common Share:                      
Income taxes (benefit)                 6,308 5,046 $ 16,880
New Mexico 2015 Rate Case | Public Service Company of New Mexico                      
Net Earnings Attributable to PNMR per Common Share:                      
Pre-tax impairment of investments $ 150,600       $ 150,600       150,600 150,600  
Income taxes (benefit)                 $ 45,700 $ (45,700)