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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Percentage of pension liability adjustment capitalized into construction work In process 22.70% 22.80%
Percentage of pension liability adjustment capitalized into other accounts 2.60% 2.90%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance $ (71,432)  
Total Other Comprehensive Income (Loss) (3,366) $ 2,525
Ending Balance (74,798)  
Public Service Company of New Mexico [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (71,476) (61,755)
Amounts reclassified from AOCI (pre-tax) (9,834) (2,684)
Income tax impact of amounts reclassified 3,837 1,052
Other OCI changes (pre-tax) 5,458 6,836
Income tax impact of other OCI changes (2,130) (2,679)
Total Other Comprehensive Income (Loss) (2,669) 2,525
Ending Balance (74,145) (59,230)
Public Service Company of New Mexico [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 17,346 28,008
Amounts reclassified from AOCI (pre-tax) (11,210) (4,172)
Income tax impact of amounts reclassified 4,374 1,635
Other OCI changes (pre-tax) 5,458 6,836
Income tax impact of other OCI changes (2,130) (2,679)
Total Other Comprehensive Income (Loss) (3,508) 1,620
Ending Balance 13,838 29,628
Public Service Company of New Mexico [Member] | Accumulated Defined Benefit Plans Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (88,822) (89,763)
Amounts reclassified from AOCI (pre-tax) 1,376 1,488
Income tax impact of amounts reclassified (537) (583)
Total Other Comprehensive Income (Loss) 839 905
Ending Balance (87,983) (88,858)
PNMR [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance (71,432) (61,755)
Amounts reclassified from AOCI (pre-tax) (9,688) (2,684)
Income tax impact of amounts reclassified 3,780 1,052
Other OCI changes (pre-tax) 4,169 6,836
Income tax impact of other OCI changes (1,627) (2,679)
Total Other Comprehensive Income (Loss) (3,366) 2,525
Ending Balance (74,798) (59,230)
PNMR [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning Balance 44  
Amounts reclassified from AOCI (pre-tax) 146  
Income tax impact of amounts reclassified (57)  
Other OCI changes (pre-tax) (1,289) 0
Income tax impact of other OCI changes 503 0
Total Other Comprehensive Income (Loss) (697) 0
Ending Balance $ (653) $ 0