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Income Taxes Summary of Income Tax Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits - Beginning $ 19,580,000 $ 36,105,000 $ 22,591,000
Additions based on tax positions 2,046,000 (790,000) 13,514,000
Reductions for tax positions of prior years (2,428,000) (15,735,000) 0
Settlements 0 0 0
Unrecognized Tax Benefits - End 19,198,000 19,580,000 36,105,000
PNMR [Member]
      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits that would impact effective tax rate 5,000,000    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 5,500,000    
Public Service Company of New Mexico [Member]
      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits - Beginning 10,752,000 11,918,000 (218,000)
Additions based on tax positions 1,152,000 (717,000) 12,136,000
Reductions for tax positions of prior years (1,522,000) (449,000) 0
Settlements 0 0 0
Unrecognized Tax Benefits - End 10,382,000 10,752,000 11,918,000
Unrecognized tax benefits that would impact effective tax rate 800,000    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 400,000    
Texas-New Mexico Power Company [Member]
      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits - Beginning 7,701,000 7,788,000 6,796,000
Additions based on tax positions 0 (74,000) 992,000
Reductions for tax positions of prior years (905,000) (13,000) 0
Settlements 0 0 0
Unrecognized Tax Benefits - End 6,796,000 7,701,000 7,788,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 6,800,000