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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Equity [Abstract]        
Percentage of pension liability adjustment capitalized into construction work In process     24.30% 22.40%
Percentage of pension liability adjustment capitalized into other accounts     2.50% 2.50%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ (71,432)  
Total Other Comprehensive Income (Loss) $ 1,063 $ (7,475) (2,211) $ (9,545)
Ending Balance (73,643)   (73,643)  
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)     (6,007) (18,088)
Income tax impact of amounts reclassified     2,344 7,089
Other OCI changes (pre-tax)     3,115 3,095
Income tax impact of other OCI changes     (1,216) (1,213)
Total Other Comprehensive Income (Loss) 671 (7,047) (1,764) (9,117)
Ending Balance (73,240) (70,872) (73,240) (70,872)
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)     (10,135) (22,552)
Income tax impact of amounts reclassified     3,955 8,838
Other OCI changes (pre-tax)     3,115 3,095
Income tax impact of other OCI changes     (1,216) (1,213)
Total Other Comprehensive Income (Loss)     (4,281) (11,832)
Ending Balance 13,065 16,176 13,065 16,176
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)     4,128 4,464
Income tax impact of amounts reclassified     (1,611) (1,749)
Total Other Comprehensive Income (Loss)     2,517 2,715
Ending Balance (86,305) (87,048) (86,305) (87,048)
PNMR [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (71,432) (61,755)
Amounts reclassified from AOCI (pre-tax)     (5,434) (18,088)
Income tax impact of amounts reclassified     2,120 7,089
Other OCI changes (pre-tax)     1,810 2,391
Income tax impact of other OCI changes     (707) (937)
Total Other Comprehensive Income (Loss)     (2,211) (9,545)
Ending Balance (73,643) (71,300) (73,643) (71,300)
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)     573  
Income tax impact of amounts reclassified     (224)  
Other OCI changes (pre-tax)     (1,305) (704)
Income tax impact of other OCI changes     509 276
Total Other Comprehensive Income (Loss)     (447) (428)
Ending Balance $ (403) $ (428) $ (403) $ (428)