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Variable Interest Entities (Details)
 12 Months Ended
Feb. 01, 2016
USD ($)
Jan. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
lease
investor
MW
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 20, 2018
USD ($)
Jul. 19, 2016
USD ($)
May 31, 2016
MW
Jan. 15, 2016
lease
MW
Jan. 15, 2015
lease
Dec. 31, 1986
lease
Dec. 31, 1985
lease
Variable Interest Entity, Statement Of Operation [Abstract]                        
Earnings attributable to non-controlling interest     $ 15,112,000 $ 15,017,000 $ 14,519,000              
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Current assets     302,524,000 294,420,000                
Total assets     6,865,551,000 6,646,103,000 6,471,080,000              
Current liabilities     512,453,000 835,644,000                
Owners’ equity – non-controlling interest     64,212,000 66,195,000                
Accrued lease payments     31,772,000                  
Public Service Company of New Mexico                        
Variable Interest Entity, Statement Of Operation [Abstract]                        
Earnings attributable to non-controlling interest     15,112,000 15,017,000 14,519,000              
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Current assets     270,319,000 243,631,000                
Total assets     5,035,883,000 4,921,563,000                
Current liabilities     223,023,000 218,496,000                
Owners’ equity – non-controlling interest     $ 64,212,000 66,195,000                
Number of different institutional investors of trust lessors | investor     5                  
Accrued lease payments     $ 27,691,000                  
Public Service Company of New Mexico | Palo Verde Nuclear Generating Station                        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Variable Interest Entities, Other financial obligations due to beneficial owner     0                  
Variable interest entities, Exposure beyond contractual lease payments     0                  
Variable interest entities, Additional rights to assets beyond use of leased assets     0                  
Variable interest entity, nonconsolidated, carrying amount, assets     $ 0                  
Public Service Company of New Mexico | Valencia                        
Variable Interest Entity [Line Items]                        
Number of megawatts purchased (in megawatts) | MW     158                  
Payment for fixed charges     $ 19,600,000 19,600,000 19,300,000              
Payment for variable charges     $ 1,400,000 1,300,000 1,100,000              
Purchase price, percentage of the book value reduced by related indebtedness     50.00%                  
Purchase price, percentage of fair market value     50.00%                  
Variable Interest Entity, Statement Of Operation [Abstract]                        
Operating revenues     $ 21,025,000 20,887,000 20,371,000              
Operating expenses     (5,913,000) (5,870,000) (5,852,000)              
Earnings attributable to non-controlling interest     15,112,000 15,017,000 $ 14,519,000              
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Current assets     2,684,000 2,688,000                
Net property, plant and equipment     62,066,000 64,109,000                
Total assets     64,750,000 66,797,000                
Current liabilities     538,000 602,000                
Owners’ equity – non-controlling interest     $ 64,212,000 66,195,000                
Number of years the operating licenses for plants were extended     20 years                  
Public Service Company of New Mexico | Valencia | Maximum                        
Variable Interest Entity [Line Items]                        
Option to purchase a percentage of the plant or VIE (up to )     50.00%                  
Public Service Company of New Mexico | PVNGS | Palo Verde Nuclear Generating Station                        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Accrued lease payments       $ 8,300,000                
NM Capital | Coal Supply | San Juan Generating Station                        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Loan agreement $ 125,000,000.0 $ 125,000,000.0                    
Issuance in letters of credit   $ 30,300,000         $ 30,300,000          
NM Capital | Coal Supply | San Juan Coal Company, Westmoreland                        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Amount outstanding           $ 50,100,000            
Palo Verde Nuclear Generating Station, Unit 1 Leases | Public Service Company of New Mexico                        
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Number of leases | lease                   4   4
Palo Verde Nuclear Generating Station, Unit 2 Leases | Public Service Company of New Mexico                        
Variable Interest Entity [Line Items]                        
Number of megawatts purchased (in megawatts) | MW               64.1 64.1      
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]                        
Number of leases | lease     3           1   4  
Number of leases under which assets were purchased | lease                 3