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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity [Abstract]        
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process     23.00% 16.40%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts     2.10% 2.50%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ (58,140) $ (81,630)
Amounts reclassified from AOCI (pre-tax)     (6,105) (3,573)
Income tax impact of amounts reclassified     2,411 1,417
Other OCI changes (pre-tax)     9,702 8,594
Income tax impact of other OCI changes     (3,756) (3,402)
Net change after income taxes 1,461 (1,903) 2,252 3,036
Ending Balance (55,888) (78,594) (55,888) (78,594)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     25,748 16,406
Amounts reclassified from AOCI (pre-tax)     (8,857) (6,854)
Income tax impact of amounts reclassified     3,488 2,714
Other OCI changes (pre-tax)     9,855 8,591
Income tax impact of other OCI changes     (3,809) (3,401)
Net change after income taxes     677 1,050
Ending Balance 26,425 17,456 26,425 17,456
Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax)     2,576 3,182
Income tax impact of amounts reclassified     (1,016) (1,262)
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes     1,560 1,920
Ending Balance (82,065) (95,900) (82,065) (95,900)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (263) (216)
Amounts reclassified from AOCI (pre-tax)     176 99
Income tax impact of amounts reclassified     (61) (35)
Other OCI changes (pre-tax)     (153) 3
Income tax impact of other OCI changes     53 (1)
Net change after income taxes     15 66
Ending Balance (248) (150) (248) (150)
Public Service Company of New Mexico [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (57,877) (81,414)
Amounts reclassified from AOCI (pre-tax)     (6,281) (3,672)
Income tax impact of amounts reclassified     2,472 1,452
Other OCI changes (pre-tax)     9,855 8,591
Income tax impact of other OCI changes     (3,809) (3,401)
Net change after income taxes 1,382 (1,930) 2,237 2,970
Ending Balance (55,640) (78,444) (55,640) (78,444)
Public Service Company of New Mexico [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     25,748 16,406
Amounts reclassified from AOCI (pre-tax)     (8,857) (6,854)
Income tax impact of amounts reclassified     3,488 2,714
Other OCI changes (pre-tax)     9,855 8,591
Income tax impact of other OCI changes     (3,809) (3,401)
Net change after income taxes     677 1,050
Ending Balance 26,425 17,456 26,425 17,456
Public Service Company of New Mexico [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (83,625) (97,820)
Amounts reclassified from AOCI (pre-tax)     2,576 3,182
Income tax impact of amounts reclassified     (1,016) (1,262)
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes     1,560 1,920
Ending Balance (82,065) (95,900) (82,065) (95,900)
Public Service Company of New Mexico [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance          
Amounts reclassified from AOCI (pre-tax)          
Income tax impact of amounts reclassified          
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes          
Ending Balance            
Texas-New Mexico Power Company [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (263) (216)
Amounts reclassified from AOCI (pre-tax)     176 99
Income tax impact of amounts reclassified     (61) (35)
Other OCI changes (pre-tax)     (153) 3
Income tax impact of other OCI changes     53 (1)
Net change after income taxes 79 27 15 66
Ending Balance (248) (150) (248) (150)
Texas-New Mexico Power Company [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance          
Amounts reclassified from AOCI (pre-tax)          
Income tax impact of amounts reclassified          
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes          
Ending Balance            
Texas-New Mexico Power Company [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance          
Amounts reclassified from AOCI (pre-tax)          
Income tax impact of amounts reclassified          
Other OCI changes (pre-tax)          
Income tax impact of other OCI changes          
Net change after income taxes          
Ending Balance            
Texas-New Mexico Power Company [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (263) (216)
Amounts reclassified from AOCI (pre-tax)     176 99
Income tax impact of amounts reclassified     (61) (35)
Other OCI changes (pre-tax)     (153) 3
Income tax impact of other OCI changes     53 (1)
Net change after income taxes     15 66
Ending Balance $ (248) $ (150) $ (248) $ (150)