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Pension and Other Postretirement Benefit Plans APBO, PBO, Fair Value of Plan Assets, and Funded Status of the Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Non-current liability $ 224,565 $ 224,766  
Public Service Company of New Mexico [Member]
      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Non-current liability 208,618 213,688  
Public Service Company of New Mexico [Member] | Pension Plan [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation at beginning of year 588,874 593,457  
Service cost 0 0 0
Interest cost 32,232 32,804 34,073
Actuarial (gain) loss 94,361 1,197  
Benefits paid (39,918) (38,584)  
Benefit Obligation at end of year 675,549 588,874 593,457
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 427,386 392,788  
Actual return on plan assets 52,927 31,671  
Employer contributions 77,700 41,511  
Benefits paid (39,918) (38,584)  
Fair value of plan assets at end of year 518,095 427,386 392,788
Funded status - asset (liability) (157,454) (161,488)  
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation at beginning of year 96,221 99,486  
Service cost 217 259 419
Interest cost 5,293 5,378 7,650
Participants contributions 2,266 2,206  
Actuarial (gain) loss 5,008 712  
Benefits paid (9,392) (10,315)  
Plan amendments 0 (1,505)  
Benefit Obligation at end of year 99,613 96,221 99,486
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 58,776 61,749  
Actual return on plan assets 9,285 2,263  
Employer contributions 3,529 2,873  
Participants contributions 2,266 2,206  
Benefits paid (9,392) (10,315)  
Fair value of plan assets at end of year 64,464 58,776 61,749
Funded status - asset (liability) (35,149) (37,445)  
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation at beginning of year 16,191 17,020  
Service cost 0 0 0
Interest cost 876 930 1,053
Actuarial (gain) loss 1,895 (252)  
Benefits paid (1,495) (1,507)  
Benefit Obligation at end of year 17,467 16,191 17,020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid (1,495) (1,507)  
Less current liability 1,452 1,436  
Non-current liability 16,015 14,755  
Texas-New Mexico Power Company [Member]
      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Non-current liability 15,947 11,078  
Texas-New Mexico Power Company [Member] | Pension Plan [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation at beginning of year 67,234 72,260  
Service cost 0 0 0
Interest cost 3,635 3,800 4,126
Actuarial (gain) loss 11,434 (2,793)  
Benefits paid (5,663) (6,033)  
Benefit Obligation at end of year 76,640 67,234 72,260
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 59,952 60,387  
Actual return on plan assets 6,951 4,447  
Employer contributions 5,300 1,151  
Benefits paid (5,663) (6,033)  
Fair value of plan assets at end of year 66,540 59,952 60,387
Funded status - asset (liability) (10,100) (7,282)  
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation at beginning of year 11,344 12,152  
Service cost 244 306 289
Interest cost 624 654 711
Participants contributions 404 281  
Actuarial (gain) loss 2,727 (862)  
Benefits paid (1,665) (1,187)  
Plan amendments 0 0  
Benefit Obligation at end of year 13,678 11,344 12,152
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 8,303 8,596  
Actual return on plan assets 1,259 262  
Employer contributions 342 351  
Participants contributions 404 281  
Benefits paid (1,665) (1,187)  
Fair value of plan assets at end of year 8,643 8,303 8,596
Funded status - asset (liability) (5,035) (3,041)  
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]
      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit Obligation at beginning of year 844 884  
Service cost 0 0 0
Interest cost 45 46 52
Actuarial (gain) loss 107 8  
Benefits paid (94) (94)  
Benefit Obligation at end of year 902 844 884
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Benefits paid (94) (94)  
Less current liability 90 89  
Non-current liability $ 812 $ 755