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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]        
Percentage of pension liability adjustment capitalized into construction work In process     24.10% 23.00%
Percentage of pension liability adjustment capitalized into other accounts     2.60% 2.70%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ (71,432)  
Total Other Comprehensive Income (Loss) $ 92 $ (4,595) (3,274) $ (2,070)
Ending Balance (74,706)   (74,706)  
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)     (2,297) (9,561)
Income tax impact of amounts reclassified     896 3,747
Other OCI changes (pre-tax)     (1,695) 6,157
Income tax impact of other OCI changes     661 (2,413)
Total Other Comprehensive Income (Loss) 234 (4,595) (2,435) (2,070)
Ending Balance (73,911) (63,825) (73,911) (63,825)
Public Service Company of New Mexico [Member] | Unrealized Gains on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     17,346 28,008
Amounts reclassified from AOCI (pre-tax)     (5,049) (12,537)
Income tax impact of amounts reclassified     1,970 4,913
Other OCI changes (pre-tax)     (1,695) 6,157
Income tax impact of other OCI changes     661 (2,413)
Total Other Comprehensive Income (Loss)     (4,113) (3,880)
Ending Balance 13,233 24,128 13,233 24,128
Public Service Company of New Mexico [Member] | Pension Liability Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (88,822) (89,763)
Amounts reclassified from AOCI (pre-tax)     2,752 2,976
Income tax impact of amounts reclassified     (1,074) (1,166)
Total Other Comprehensive Income (Loss)     1,678 1,810
Ending Balance (87,144) (87,953) (87,144) (87,953)
PNMR [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (71,432) (61,755)
Amounts reclassified from AOCI (pre-tax)     (1,926) (9,561)
Income tax impact of amounts reclassified     751 3,747
Other OCI changes (pre-tax)     (3,441) 6,157
Income tax impact of other OCI changes     1,342 (2,413)
Total Other Comprehensive Income (Loss)     (3,274) (2,070)
Ending Balance (74,706) (63,825) (74,706) (63,825)
PNMR [Member] | Fair Value Adjustment for Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     44  
Amounts reclassified from AOCI (pre-tax)     371  
Income tax impact of amounts reclassified     (145)  
Other OCI changes (pre-tax)     (1,746) 0
Income tax impact of other OCI changes     681 0
Total Other Comprehensive Income (Loss)     (839) 0
Ending Balance $ (795) $ 0 $ (795) $ 0