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Summary of Significant Accounting Policies - Real Estate Investments (Details)
$ in Thousands
12 Months Ended
Sep. 28, 2020
USD ($)
entity
Dec. 19, 2019
USD ($)
Apr. 22, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Components of Real Estate Investments [Abstract]            
Land       $ 14,168 $ 14,168  
Buildings and improvements       43,961 43,531  
Total real estate investment       58,129 57,699  
Proceeds from sale of real estate held-for-investment     $ 745      
Gain on sale of real estate investments       948 929 $ 0
Operating Leases, Future Minimum Payments Receivable [Abstract]            
2021       4,264    
2022       2,745    
2023       2,565    
2024       2,645    
2025       2,833    
Thereafter       7,711    
Land and Building            
Assets Leased or Available for Lease [Abstract]            
Assets leased or available for lease       57,273 $ 56,839  
Connecticut Water Company            
Components of Real Estate Investments [Abstract]            
Gain on sale of real estate investments   $ 4        
Maine Water Company            
Components of Real Estate Investments [Abstract]            
Proceeds from sale of real estate held-for-investment   600   143    
Gain on sale of real estate investments   180   (100)    
Selling expense       $ 45    
Conservation easement, value   1,200        
Contribution of property   $ 600        
Parent            
Components of Real Estate Investments [Abstract]            
Gain on sale of real estate investments     521      
Noncontrolling Interest            
Components of Real Estate Investments [Abstract]            
Gain on sale of real estate investments     $ 224      
San Jose Water Company            
Components of Real Estate Investments [Abstract]            
Sale Of Real Estate Held-For-Investment, Number Of Nonutility Properties | entity 6          
Proceeds from sale of real estate held-for-investment $ 1,075          
Gain on sale of real estate investments 1,048          
Selling expense $ 22          
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