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Pension and Other Postretirement Benefit Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Public Service Company of New Mexico [Member] | Pension Plan [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost $ 0 $ 0
Interest cost 7,541,000 7,035,000
Long-term return on plan assets (9,511,000) (10,482,000)
Amortization of net loss 3,255,000 3,710,000
Amortization of prior service cost (241,000) 19,000
Net periodic benefit cost 1,044,000 282,000
Defined Benefit Plan, Contributions by Employer   60,000,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 61,500,000  
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Minimum [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.20%  
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Maximum [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.50%  
Public Service Company of New Mexico [Member] | OPEB [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 45,000 65,000
Interest cost 1,159,000 1,028,000
Long-term return on plan assets (1,410,000) (1,261,000)
Amortization of net loss 556,000 1,061,000
Amortization of prior service cost (336,000) (336,000)
Net periodic benefit cost 14,000 557,000
Defined Benefit Plan, Contributions by Employer 800,000 500,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 14,000,000  
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 3,300,000  
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 0
Interest cost 205,000 180,000
Long-term return on plan assets 0 0
Amortization of net loss 52,000 58,000
Amortization of prior service cost 0 0
Net periodic benefit cost 257,000 238,000
Defined Benefit Plan, Contributions by Employer 400,000 400,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 1,500,000  
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 0
Interest cost 798,000 772,000
Long-term return on plan assets (1,132,000) (1,212,000)
Amortization of net loss 166,000 262,000
Amortization of prior service cost 0 0
Net periodic benefit cost (168,000) (178,000)
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 0  
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Minimum [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.20%  
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Maximum [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate (as a percent) 5.50%  
Texas-New Mexico Power Company [Member] | OPEB [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 59,000 75,000
Interest cost 155,000 141,000
Long-term return on plan assets (133,000) (126,000)
Amortization of net loss (31,000) 0
Amortization of prior service cost 8,000 14,000
Net periodic benefit cost 58,000 104,000
Defined Benefit Plan, Contributions by Employer 0 1,000,000
Defined Benefit Plan, Estimated Future Employer Contributions After Current Fiscal Year 1,400,000  
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 400,000  
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Service cost 0 0
Interest cost 10,000 9,000
Long-term return on plan assets 0 0
Amortization of net loss 0 0
Amortization of prior service cost 0 0
Net periodic benefit cost 10,000 9,000
Defined Benefit Plan Total Expected Employer Contributions for Fiscal Year 100,000  
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member] | Maximum [Member]
    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Contributions by Employer $ 100,000 $ 100,000