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Business Combination (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Oct. 09, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]          
Long-term borrowings   $ 85,000 $ 80,000    
Borrowings on line of credit   226,884 $ 73,000    
Assets Acquired          
Goodwill   627,036   $ 627,036 $ 628,287
CTWS [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred, Acquiree's Common Shares Converted In Cash Per Share $ 70.00        
Payments to Acquire Businesses, Gross $ 838,476        
Cash Acquired from Acquisition 3,011        
Adjustments to Additional Paid in Capital, Share-based Compensation, Equity Award Assumed in Acquisition 6,384        
Assets Acquired          
Utility plant, net 750,703 750,703   750,703  
Utility plant, net, measurement period adjustments       0  
Nonutility plant 848 848   848  
Nonutility plant, measurement period adjustments       0  
Current assets 42,673 41,506   41,506  
Current assets, measurement period adjustments       (1,167)  
Investments 12,489 12,489   12,489  
Investments, measurement period adjustments       0  
Regulatory assets and deferred charges, less current portion 83,132 78,825   78,825  
Regulatory assets and deferred charges, less current portion, measurement period adjustments       (4,307)  
Other intangible assets 17,181 17,181   17,181  
Other intangible assets, measurement period adjustments       0  
Other assets 2,592 2,592   2,592  
Other assets, measurement period adjustments       0  
Goodwill 626,523 625,301   625,301  
Goodwill, measurement period adjustments       (1,222)  
Total assets acquired 1,536,141 1,529,445   1,529,445  
Total assets acquired, measurement period adjustments       (6,696)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract]          
Long-term debt 281,009 281,009   281,009  
Long-term debt, measurement period adjustments       0  
Current liabilities, including maturities of long-term debt 125,772 125,797   125,797  
Current liabilities, including maturities of long-term debt       25  
Deferred income taxes 107,789 100,644   100,644  
Deferred income taxes, measurement period adjustments       (7,145)  
Postretirement benefit plans 31,789 31,789   31,789  
Postretirement benefit plan, measurement period adjustments       0  
Contributions in aid of construction and construction advances 137,327 137,327   137,327  
Contributions in aid of construction and construction advancesPostretirement benefit plan, measurement period adjustments       0  
Other long-term liabilities 10,607 11,031   11,031  
Other long-term liabilities, measurement period adjustments       424  
Total liabilities assumed 694,293 687,597   687,597  
Total liabilities assumed, measurement period adjustments       (6,696)  
Assumed equity $ 841,848 $ 841,848   841,848  
Assumed equity, measurement period adjustments       $ 0