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Income Taxes Summary of Income Tax Contingencies (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions $ (54,000)    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions (745,000)    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits - Beginning 19,198,000 19,580,000 36,105,000
Additions based on tax positions   2,046,000 (790,000)
Reductions for tax positions of prior years   (2,428,000) (15,735,000)
Settlements 0 0 0
Unrecognized Tax Benefits - End 19,889,000 19,198,000 19,580,000
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 5,600,000    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 5,500,000    
Public Service Company of New Mexico [Member]
      
Income Taxes [Line Items]      
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions (54,000)    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions (745,000)    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits - Beginning 10,382,000 10,752,000 11,918,000
Additions based on tax positions   1,152,000 (717,000)
Reductions for tax positions of prior years   (1,522,000) (449,000)
Settlements 0 0 0
Unrecognized Tax Benefits - End 11,073,000 10,382,000 10,752,000
Unrecognized tax benefits that would impact effective tax rate 1,400,000    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 400,000    
Texas-New Mexico Power Company [Member]
      
Income Taxes [Line Items]      
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions 0    
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 0    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits - Beginning 6,796,000 7,701,000 7,788,000
Additions based on tax positions   0 (74,000)
Reductions for tax positions of prior years   (905,000) (13,000)
Settlements 0 0 0
Unrecognized Tax Benefits - End 6,796,000 6,796,000 7,701,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 6,800,000