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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Public Service Company of New Mexico [Member] | Pension Plan [Member]          
Components of Net Periodic Benefit Cost          
Service cost $ 0 $ 0 $ 0 $ 0  
Interest cost 7,577,000 7,064,000 22,731,000 21,191,000  
Expected return on plan assets (8,854,000) (9,831,000) (26,562,000) (29,492,000)  
Amortization of net (gain) loss 3,455,000 3,705,000 10,365,000 11,115,000  
Amortization of prior service cost (241,000) (241,000) (724,000) (724,000)  
Net Periodic Benefit Cost (Income) 1,937,000 697,000 5,810,000 2,090,000  
Contributions by employer   0   30,000,000  
Total expected employer contributions for fiscal year 0   0    
Total expected employer contributions for future fiscal years 0   $ 0    
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Minimum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     4.80%    
Public Service Company of New Mexico [Member] | Pension Plan [Member] | Maximum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     5.70%    
Public Service Company of New Mexico [Member] | OPEB [Member]          
Components of Net Periodic Benefit Cost          
Service cost 35,000 51,000 $ 105,000 153,000  
Interest cost 1,087,000 1,022,000 3,260,000 3,067,000  
Expected return on plan assets (1,371,000) (1,403,000) (4,113,000) (4,208,000)  
Amortization of net (gain) loss 286,000 491,000 858,000 1,474,000  
Amortization of prior service cost (7,000) (160,000) (22,000) (481,000)  
Net Periodic Benefit Cost (Income) 30,000 1,000 88,000 5,000  
Contributions by employer 800,000 800,000 2,400,000 2,400,000  
Public Service Company of New Mexico [Member] | Executive Retirement Program [Member]          
Components of Net Periodic Benefit Cost          
Service cost 0 0 0 0  
Interest cost 203,000 190,000 609,000 570,000  
Expected return on plan assets 0 0 0 0  
Amortization of net (gain) loss 64,000 81,000 192,000 243,000  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 267,000 271,000 801,000 813,000  
Contributions by employer 400,000 400,000 1,200,000 1,200,000  
Total expected employer contributions for fiscal year 1,500,000   1,500,000    
Total expected employer contributions for future fiscal years 5,900,000   5,900,000    
Texas-New Mexico Power Company [Member] | Pension Plan [Member]          
Components of Net Periodic Benefit Cost          
Service cost 0 0 0 0  
Interest cost 826,000 761,000 2,478,000 2,282,000  
Expected return on plan assets (986,000) (1,105,000) (2,957,000) (3,315,000)  
Amortization of net (gain) loss 175,000 195,000 525,000 586,000  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 15,000 (149,000) 46,000 (447,000)  
Contributions by employer         $ 0
Total expected employer contributions for fiscal year 0   0    
Total expected employer contributions for future fiscal years 0   $ 0    
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Minimum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     4.80%    
Texas-New Mexico Power Company [Member] | Pension Plan [Member] | Maximum [Member]          
Components of Net Periodic Benefit Cost          
Assumptions used calculating net periodic benefit cost, discount rate     5.70%    
Texas-New Mexico Power Company [Member] | OPEB [Member]          
Components of Net Periodic Benefit Cost          
Service cost 46,000 62,000 $ 139,000 185,000  
Interest cost 169,000 152,000 508,000 456,000  
Expected return on plan assets (122,000) (130,000) (367,000) (390,000)  
Amortization of net (gain) loss (10,000) 0 (30,000) 0  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 83,000 84,000 250,000 251,000  
Contributions by employer 0 0 0 0  
Total expected employer contributions for fiscal year 300,000   300,000    
Total expected employer contributions for future fiscal years 1,400,000   1,400,000    
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member]          
Components of Net Periodic Benefit Cost          
Service cost 0 0 0 0  
Interest cost 10,000 9,000 30,000 27,000  
Expected return on plan assets 0 0 0 0  
Amortization of net (gain) loss 1,000 1,000 1,000 3,000  
Amortization of prior service cost 0 0 0 0  
Net Periodic Benefit Cost (Income) 11,000 10,000 31,000 30,000  
Total expected employer contributions for fiscal year 100,000   100,000    
Total expected employer contributions for future fiscal years 400,000   400,000    
Texas-New Mexico Power Company [Member] | Executive Retirement Program [Member] | Maximum [Member]          
Components of Net Periodic Benefit Cost          
Contributions by employer $ 100,000 $ 100,000 $ 100,000 $ 100,000