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Stock-Based Compensation Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options, Outstanding at beginning of period, Shares 3,948,262 4,274,019 3,725,907
Options, Outstanding at beginning of period, Weighted-Average Exercise Price, in dollars per share $ 18.33 $ 19.19 $ 21.54
Options, Granted, Shares 0 618,708 790,064
Options, Granted, Weighted-Average Exercise Price, in dollars per share $ 0.00 $ 12.23 $ 8.23
Options, Exercised, Shares (493,590) (140,986) (6,236)
Options, Exercised, Weighted-Average Exercise Price, in dollars per share $ 11.39 $ 8.69 $ 10.22
Options, Forfeited, Shares (12,999) (106,966) (69,200)
Options, Forfeited, Weighted-Average Exercise Price, in dollars per share $ 11.46 $ 11.02 $ 16.40
Options, Expired, Shares (239,444) (696,513) (166,516)
Options, Expired, Weighted-Average Exercise Price, in dollars per share $ 24.71 $ 21.26 $ 21.32
Options, Outstanding at end of period, Shares 3,202,229 3,948,262 4,274,019
Options, Outstanding at end of period, Weighted-Average Exercise Price, in dollars per share $ 18.95 $ 18.33 $ 19.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options, Outstanding at end of period, Aggregate Intrinsic Value $ 1,610,851 [1]    
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years) 4.80    
Options, Exercisable at end of period, Shares 2,738,362    
Options, Exercisable at end of period, Weighted-Average Exercise Price, in dollars per share $ 22.16    
Options, Exercisable at end of period, Aggregate Intrinsic Value 1,146,714    
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years) 4.29    
Options / Restricted Stock available for future grant, Shares 3,240,000    
Options, Outstanding at end of period, No intrinsic value 1,591,648,000    
Weighted-average grant date fair value options granted, in dollars per share $ 0.00 $ 3.05 $ 1.63
Total fair value of options that vested 1,189,000 1,393,000 1,179,000
Total intrinsic value of options exercised 2,616,000 525,000 15,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Risk-free interest rates, percentage   2.13% 1.56%
Restricted Stock and Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Expected quarterly dividends per share, in dollars per share $ 0.125 $ 0.125 $ 0.125
Risk-free interest rates, percentage 1.35% 1.49% 3.11%
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested Restricted Stock, Nonvested at beginning of period, Shares 237,021    
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value, in dollars per share $ 9.24    
Nonvested Restricted Stock, Granted, Shares 308,985    
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value, in dollars per share $ 13.79 $ 9.26 $ 7.81
Nonvested Restricted Stock, Vested, Shares (125,076)    
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value, in dollars per share $ 9.92    
Nonvested Restricted Stock, Forfeited, Shares (2,200)    
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value, in dollars per share $ 13.67    
Nonvested Restricted Stock, Nonvested at end of period, Shares 418,730 237,021  
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value, in dollars per share $ 12.36 $ 9.24  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 1,240,000 $ 1,365,000 $ 1,900,000
Executive [Member] | Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Options / Restricted Stock available for future grant, Shares   42,768,000  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in 2012 117,174    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in 2013 167,382    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in 2014 188,401    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested Restricted Stock, Granted, Shares 88,913 102,375,000  
[1] At December 31, 2011, the exercise price of 1,591,648 outstanding stock options is greater than the closing price of PNMR common stock on that date so those options have no intrinsic value.