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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 328,897 $ 317,665  
Cost of energy 112,614 104,706  
Margin 216,283 212,959  
Other operating expenses 125,565 121,448  
Depreciation and amortization 41,965 40,807  
Operating income 48,753 50,704  
Interest income 2,117 2,634  
Other income (deductions) 1,216 (110)  
Net interest charges (29,535) (31,297)  
Earnings before Income Taxes 22,551 21,931  
Income taxes (benefit) 6,420 7,969  
Net Earnings 16,131 13,962  
Valencia non-controlling interest (3,531) (3,204)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Attributable to PNMR 12,468 10,626  
Total Assets 5,507,026 5,370,760 5,500,210
Goodwill 278,297 278,297 278,297
PNM Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 262,736 257,894  
Cost of energy 96,626 91,660  
Margin 166,110 166,234  
Other operating expenses 107,724 103,161  
Depreciation and amortization 27,082 25,834  
Operating income 31,304 37,239  
Interest income 2,128 2,673  
Other income (deductions) 1,668 1,407  
Net interest charges (19,812) (19,957)  
Earnings before Income Taxes 15,288 21,362  
Income taxes (benefit) 4,083 6,589  
Net Earnings 11,205 14,773  
Valencia non-controlling interest (3,531) (3,204)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Attributable to PNMR 7,542 11,437  
Total Assets 4,219,635 4,155,257  
Goodwill 51,632 51,632  
TNMP Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 66,161 59,771  
Cost of energy 15,988 13,046  
Margin 50,173 46,725  
Other operating expenses 21,069 21,990  
Depreciation and amortization 11,842 11,681  
Operating income 17,262 13,054  
Interest income 0 0  
Other income (deductions) 189 208  
Net interest charges (6,598) (7,246)  
Earnings before Income Taxes 10,853 6,016  
Income taxes (benefit) 4,050 2,290  
Net Earnings 6,803 3,726  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Attributable to PNMR 6,803 3,726  
Total Assets 1,173,028 1,098,942  
Goodwill 226,665 226,665  
Corporate and Other [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0 0  
Cost of energy 0 0  
Margin 0 0  
Other operating expenses (3,228) (3,703)  
Depreciation and amortization 3,041 3,292  
Operating income 187 411  
Interest income (11) (39)  
Other income (deductions) (641) (1,725)  
Net interest charges (3,125) (4,094)  
Earnings before Income Taxes (3,590) (5,447)  
Income taxes (benefit) (1,713) (910)  
Net Earnings (1,877) (4,537)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Attributable to PNMR (1,877) (4,537)  
Total Assets 114,363 116,561  
Goodwill $ 0 $ 0