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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Unrealized holding gains (losses) arising during the period, income tax (expense) $ (15,262) $ (13,577) $ (6,643)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 14,755 13,956 3,070
Experience gain (loss), income tax (expense) benefit 11,910 1,187 6,328
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, income tax (expense) benefit (1,825) (1,699) (1,217)
Change in fair market value, income tax (expense) 153 349 (4,839)
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) (65) (1,230) 18,120
Public Service Company of New Mexico [Member]
      
Unrealized holding gains (losses) arising during the period, income tax (expense) (15,262) (13,577) (6,643)
Reclassification adjustment for (gains) included in net earnings (loss), income tax expense 14,755 13,956 3,070
Experience gain (loss), income tax (expense) benefit 11,910 1,334 6,289
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, income tax (expense) benefit (1,825) (1,694) (1,218)
Change in fair market value, income tax (expense) 0 0 (3,406)
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) 0 (11) 11,725
Texas-New Mexico Power Company [Member]
      
Experience gain (loss), income tax (expense) benefit 0 (147) 41
Reclassification adjustment for amortization of experience (gain) loss recognized as net periodic benefit cost, income tax (expense) benefit 0 (5) 1
Change in fair market value, income tax (expense) 153 430 1,139
Reclassification adjustment for (gains) losses included in net earnings (loss), income tax expense (benefit) $ (65) $ (1,068) $ (399)