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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Equity [Abstract]        
Percentage of Pension Liability Adjustment Capitalized into Construction Work In Process     23.00% 23.00%
Percentage of Pension Liability Adjustment Capitalized into Other Accounts     2.70% 2.10%
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     $ (61,755)  
Net change after income taxes $ (4,595) $ 1,461 (2,070) $ 2,252
Ending Balance (63,825)   (63,825)  
PNMR and PNM [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)     (12,537) (8,857)
Income tax impact of amounts reclassified     4,913 3,488
Other OCI changes (pre-tax)     6,157 9,855
Income tax impact of other OCI changes     (2,413) (3,809)
Net change after income taxes     (3,880) 677
Ending Balance 24,128 26,425 24,128 26,425
PNMR and PNM [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)     2,976 2,576
Income tax impact of amounts reclassified     (1,166) (1,016)
Net change after income taxes     1,810 1,560
Ending Balance (87,953) (82,065) (87,953) (82,065)
PNM [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (61,755) (57,877)
Amounts reclassified from AOCI (pre-tax)     (9,561) (6,281)
Income tax impact of amounts reclassified     3,747 2,472
Other OCI changes (pre-tax)     6,157 9,855
Income tax impact of other OCI changes     (2,413) (3,809)
Net change after income taxes     (2,070) 2,237
Ending Balance (63,825) (55,640) (63,825) (55,640)
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)
Amounts reclassified from AOCI (pre-tax)       176
Income tax impact of amounts reclassified       (61)
Other OCI changes (pre-tax)       (153)
Income tax impact of other OCI changes       53
Net change after income taxes       15
Ending Balance   (248)   (248)
PNMR [Member]        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning Balance     (61,755) (58,140)
Amounts reclassified from AOCI (pre-tax)     (9,561) (6,105)
Income tax impact of amounts reclassified     3,747 2,411
Other OCI changes (pre-tax)     6,157 9,702
Income tax impact of other OCI changes     (2,413) (3,756)
Net change after income taxes     (2,070) 2,252
Ending Balance $ (63,825) $ (55,888) $ (63,825) $ (55,888)