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Stock-Based Compensation (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Restricted Stock [Member]
Sep. 30, 2011
Restricted Stock [Member]
Dec. 31, 2011
Executive [Member]
Performance Shares [Member]
Dec. 31, 2009
Executive [Member]
Performance Shares [Member]
Sep. 30, 2012
Executive [Member]
Performance Shares [Member]
Sep. 30, 2012
Achieves a specified improvement in total shareholder return at the end of 2016 compared to 2011 and she remains an employee [Member]
Common Stock [Member]
Chairman, President, and Chief Executive Officer [Member]
Sep. 30, 2012
Achieves a specified improvement in total shareholder return at the end of 2014 compared to 2011 and she remains an employee [Member]
Common Stock [Member]
Chairman, President, and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                  
Options, Outstanding at beginning of period, Shares 3,202,229                
Options, Outstanding at beginning of period, Weighted-Average Exercise Price (in dollars per share) $ 18.95                
Options, Granted, Shares 0                
Options, Granted, Weighted-Average Exercise Price (in dollars per share) $ 0.00                
Options, Exercised, Shares (757,497)                
Options, Exercised, Weighted-Average Exercise Price (in dollars per share) $ 13.60                
Options, Forfeited, Shares (5,101)                
Options, Forfeited, Weighted-Average Exercise Price (in dollars per share) $ 12.22                
Options, Expired, Shares (265,443)                
Options, Expired, Weighted-Average Exercise Price (in dollars per share) $ 25.71                
Options, Outstanding at end of period, Shares 2,174,188                
Options, Outstanding at end of period, Weighted-Average Exercise Price (in dollars per share) $ 20.01                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                  
Options, Outstanding at end of period, Aggregate Intrinsic Value $ 9,429,630 [1]                
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years) 4 years 6 months 7 days                
Options, Exercisable at end of period, Shares 2,033,857                
Options, Exercisable at end of period, Weighted-Average Exercise Price (in dollars per share) $ 21.39                
Options, Exercisable at end of period, Aggregate Intrinsic Value 8,195,812                
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years) 4 years 3 months 26 days                
Options, Outstanding at end of period, No intrinsic value 1,108,946                
Weighted-average grant date fair value options granted (dollars per share) $ 0.00 $ 0.00              
Total fair value of options that vested 1,058,000 1,189,000              
Total intrinsic value of options exercised 4,515,000 1,077,000              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                  
Nonvested Restricted Stock, Nonvested at beginning of period, Shares     418,730            
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value (in dollars per share)     $ 12.36            
Nonvested Restricted Stock, Granted, Shares     320,597            
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value (in dollars per share)     $ 15.63 $ 13.10          
Nonvested Restricted Stock, Vested, Shares     (375,402)            
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value (in dollars per share)     $ 12.67            
Nonvested Restricted Stock, Forfeited, Shares     (7,503)            
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value (in dollars per share)     $ 12.48            
Nonvested Restricted Stock, Nonvested at end of period, Shares     356,422            
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value (in dollars per share)     $ 14.71            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]                  
Total fair value of shares that vested     $ 4,755,000 $ 1,084,000          
Expected quarterly dividends per share     $ 0.145 $ 0.125          
Risk-free interest rate     0.76% 1.20%          
Granted and Vested in Period         117,174 42,768      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year One             168,269    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Two             190,369    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three             205,878    
Shares received if achieves specified improvement in total shareholders return               135,000 35,000
[1] At September 30, 2012, the exercise price of 1,108,946 outstanding stock options is greater than the closing price of PNMR common stock on that date; therefore, those options have no intrinsic value.