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Variable Interest Entities (Details)
 3 Months Ended
Jan. 31, 2016
USD ($)
Mar. 31, 2018
USD ($)
MW
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Oct. 20, 2017
USD ($)
Jun. 29, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Results of Operations                
Earnings attributable to non-controlling interest   $ 3,677,000 $ 3,452,000          
Financial Position                
Current assets   277,299,000   $ 294,420,000        
Total assets   6,676,393,000 6,477,679,000 6,646,103,000        
Current liabilities   782,753,000   835,644,000        
Owners’ equity – non-controlling interest   65,400,000   66,195,000        
PNM                
Variable Interest Entity [Line Items]                
Amount held in a restricted bank account           $ 1,000,000 $ 7,200,000 $ 8,200,000
Results of Operations                
Earnings attributable to non-controlling interest   3,677,000 3,452,000          
Financial Position                
Current assets   228,821,000   243,631,000        
Total assets   4,925,741,000   4,921,563,000        
Current liabilities   416,312,000   218,496,000        
Owners’ equity – non-controlling interest   65,400,000   66,195,000        
PNM | Valencia                
Variable Interest Entity [Line Items]                
Payment for fixed costs   4,900,000 4,900,000          
Payment for variable costs   $ 300,000 100,000          
Long-term contract option to purchase, ownership percentage (up to)   50.00%            
Long-term contract option to purchase, purchase price - percentage of adjusted NBV   50.00%            
Long-term contract option to purchase, purchase price - percentage of FMV   50.00%            
Results of Operations                
Operating revenues   $ 4,768,000 4,927,000          
Operating expenses   (1,091,000) (1,475,000)          
Earnings attributable to non-controlling interest   3,677,000 $ 3,452,000          
Financial Position                
Current assets   2,981,000   2,688,000        
Net property, plant, and equipment   63,400,000   64,109,000        
Total assets   66,381,000   66,797,000        
Current liabilities   981,000   602,000        
Owners’ equity – non-controlling interest   $ 65,400,000   $ 66,195,000        
PNM | Valencia | Purchased through May 2028                
Variable Interest Entity [Line Items]                
Number of megawatts purchased (in megawatts) | MW   158            
NM Capital | San Juan Generating Station | Coal supply                
Variable Interest Entity [Line Items]                
Loan agreement among several entities $ 125,000,000.0              
Cash used to support bank letter or credit arrangement 30,300,000 $ 30,300,000            
NM Capital | San Juan Coal Company, Westmoreland | Coal supply                
Variable Interest Entity [Line Items]                
Loan receivable $ 125,000,000 51,000,000            
Interest receivable   1,200,000            
Scheduled principal payment proceeds   900,000            
Scheduled interest payment proceeds   $ 1,800,000            
Unaffiliated third party | San Juan Coal Company, Westmoreland | Coal supply                
Variable Interest Entity [Line Items]                
Amount held in a restricted bank account         $ 2,700,000