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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity [Abstract]        
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process     22.40% 23.60%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts     2.50% 1.70%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ (61,755)  
Net change after income taxes $ (7,475) $ (644) (9,545) $ 1,608
Ending Balance (71,300)   (71,300)  
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Other OCI changes (pre-tax)     (704) 0
Income tax impact of other OCI changes     276 0
Net change after income taxes     (428) 0
Ending Balance (428) 0 (428) 0
Public Service Company of New Mexico [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (61,755) (57,877)
Amounts reclassified from AOCI (pre-tax)     (18,088) (7,680)
Income tax impact of amounts reclassified     7,089 3,023
Other OCI changes (pre-tax)     3,095 10,202
Income tax impact of other OCI changes     (1,213) (3,946)
Net change after income taxes     (9,117) 1,599
Ending Balance (70,872) (56,278) (70,872) (56,278)
Public Service Company of New Mexico [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     28,008 25,748
Amounts reclassified from AOCI (pre-tax)     (22,552) (11,544)
Income tax impact of amounts reclassified     8,838 4,547
Other OCI changes (pre-tax)     3,095 10,202
Income tax impact of other OCI changes     (1,213) (3,946)
Net change after income taxes     (11,832) (741)
Ending Balance 16,176 25,007 16,176 25,007
Public Service Company of New Mexico [Member] | Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (89,763) (83,625)
Amounts reclassified from AOCI (pre-tax)     4,464 3,864
Income tax impact of amounts reclassified     (1,749) (1,524)
Net change after income taxes     2,715 2,340
Ending Balance (87,048) (81,285) (87,048) (81,285)
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     0 (263)
Amounts reclassified from AOCI (pre-tax)     0 167
Income tax impact of amounts reclassified     0 (58)
Other OCI changes (pre-tax)     0 (153)
Income tax impact of other OCI changes     0 53
Net change after income taxes     0 9
Ending Balance 0 (254) 0 (254)
PNMR [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (61,755) (58,140)
Amounts reclassified from AOCI (pre-tax)     (18,088) (7,513)
Income tax impact of amounts reclassified     7,089 2,965
Other OCI changes (pre-tax)     2,391 10,049
Income tax impact of other OCI changes     (937) (3,893)
Net change after income taxes     (9,545) 1,608
Ending Balance $ (71,300) $ (56,532) $ (71,300) $ (56,532)