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Fair Value of Derivative and Other Financial Instruments, Carrying Amount and Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,674,013 $ 1,565,847
Investments in PVNGS lessor notes 107,094 136,145
Other investments 12,207 18,791
Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,873,002 1,659,674
Investments in PVNGS lessor notes 108,742 141,663
Other investments 14,208 21,675
Public Service Company of New Mexico [Member] | Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,215,540 1,055,748
Investments in PVNGS lessor notes 107,094 136,145
Other investments 2,900 5,068
Public Service Company of New Mexico [Member] | Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,294,846 1,056,864
Investments in PVNGS lessor notes 108,742 141,663
Other investments 3,052 5,563
Texas-New Mexico Power Company [Member] | Carrying Amount [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 310,963 310,337
Other investments 271 282
Texas-New Mexico Power Company [Member] | Fair Value [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 413,966 385,220
Other investments $ 271 $ 282