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Summary of Significant Accounting Policies - Nonutility Properties and Real Estate Investments (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Oct. 29, 2021
USD ($)
property
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Aug. 31, 2023
well
Components of Real Estate Investments [Abstract]              
Land       $ 915,000 $ 4,137,000    
Wholesale water supply assets       0 8,465,000    
Buildings and improvements       399,000 748,000    
Subtotal       1,314,000 13,350,000    
Less: accumulated depreciation and amortization       98,000 194,000    
Total       1,216,000 13,156,000    
Impairment of long-lived asset       0 0    
Proceeds receivable from sale of real estate investments       2,801,000 0    
Number of wells acquired | well             8
Indefinite life water rights reclassified from other intangible assets to utility plant intangible assets     $ 28,386,000        
Nonutility property reclassified to utility plant     $ 11,684,000        
Warehouse Building              
Components of Real Estate Investments [Abstract]              
Impairment of long-lived asset $ 0            
Tennessee Properties              
Components of Real Estate Investments [Abstract]              
Land         13,170,000    
Buildings and improvements         44,950,000    
Subtotal         58,120,000    
Less: accumulated depreciation and amortization         17,270,000    
Total         $ 40,850,000    
Proceeds from sale of productive assets       44,000,000      
Gain (loss) on disposition of assets       $ (969,000)      
SJWC              
Components of Real Estate Investments [Abstract]              
Number of properties sold | property   2          
Proceeds from sale of real estate held-for-investment   $ 13,150,000          
Gain on sale of asset           $ 7,230,000  
Properties selling expenses           277,000  
Deferred gains on sales of properties           $ 5,442,000  
Building and Building Improvements | Minimum              
Components of Real Estate Investments [Abstract]              
Estimated useful life       7 years      
Building and Building Improvements | Maximum              
Components of Real Estate Investments [Abstract]              
Estimated useful life       39 years