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Variable Interest Entities (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
May 30, 2008
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Variable Interest Entity, Statement Of Operation [Abstract]        
Earnings Attributable to non-controlling interest $ 3,265,000 $ 3,183,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Current assets 427,947,000   462,819,000  
Assets 5,197,896,000 5,213,726,000 5,204,613,000  
Current liabilities 429,266,000   373,268,000  
Owners' equity - non-controlling interest 81,679,000   82,423,000  
Public Service Company of New Mexico [Member]
        
Variable Interest Entity, Statement Of Operation [Abstract]        
Earnings Attributable to non-controlling interest 3,265,000 3,183,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Current assets 361,427,000   459,621,000  
Assets 4,031,859,000   4,095,287,000  
Current liabilities 266,966,000   290,563,000  
Owners' equity - non-controlling interest 81,679,000   82,423,000  
Operating Leases, Renewal Options After Original Lease Term (in years) 2 years      
Operating Leases, Extended Lease Term Option (in years) 6 years      
Valencia [Member] | Public Service Company of New Mexico [Member]
        
Variable Interest Entity [Line Items]        
Number of mega watts purchased (in megawatts)       145
Long Term Contract For Purchase of Electric Power Fixed Costs 4,600,000 4,600,000    
Long Term Contract For Purchase of Electric Power Variable Charges 100,000 100,000    
Variable Interest Entity, Statement Of Operation [Abstract]        
Operating revenues 4,670,000 4,670,000    
Operating expenses (1,405,000) (1,487,000)    
Earnings Attributable to non-controlling interest 3,265,000 3,183,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Current assets 3,308,000   2,405,000  
Net property, plant and equipment 80,077,000   80,785,000  
Assets 83,385,000   83,190,000  
Current liabilities 1,706,000   767,000  
Owners' equity - non-controlling interest 81,679,000   82,423,000  
PVNGS [Member] | Public Service Company of New Mexico [Member]
        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Power Plant Operating Licenses Term (in years) 20 years      
Delta [Member] | Public Service Company of New Mexico [Member]
        
Variable Interest Entity [Line Items]        
Long Term Contract For Purchase of Electric Power Fixed Costs 1,500,000 1,500,000    
Long Term Contract For Purchase of Electric Power Variable Charges 100,000 200,000    
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Long Term Contract for Purchase of Electric Power Aggregate Amount of Contract Remaining 49,600,000      
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member]
        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Operating Leases, Future Minimum Payments Due 93,700,000      
Palo Verde Nuclear Generating Station [Member] | PVNGS [Member] | Public Service Company of New Mexico [Member]
        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Operating Leases, Future Minimum Payments Due, Current 11,800,000   26,000,000  
Palo Verde Nuclear Generating Station [Member] | Property Lease Guarantee [Member] | Maximum [Member] | Public Service Company of New Mexico [Member]
        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]        
Loss Contingency, Range of Possible Loss, Portion Not Accrued $ 174,200,000