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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 54,555 $ 57,864 $ 92,859 $ 96,456
Average Number of Common Shares:        
Outstanding during period 79,654,000 79,654,000 79,654,000 79,654,000
Vested awards of restricted stock 177,000 114,000 194,000 156,000
Average Shares - Basic 79,831,000 79,768,000 79,848,000 79,810,000
Dilutive Effect of Common Stock Equivalents:        
Stock options and restricted stock 503,000 [1] 622,000 [1] 608,000 [1] 600,000 [1]
Average Shares - Diluted 80,334,000 80,390,000 80,456,000 80,410,000
Net Earnings Per Share of Common Stock        
Basic (dollars per share) $ 0.68 $ 0.73 $ 1.16 $ 1.21
Diluted (dollars per share) $ 0.68 $ 0.72 $ 1.15 $ 1.20
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding Shares Above Entities Stock Price (in shares)     793,010  
[1] Excludes the effect of out-of-the-money options for 793,010 shares of common stock at September 30, 2013.