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Rate and Regulatory Matters (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 01, 2024
Oct. 31, 2024
Oct. 30, 2024
Sep. 30, 2024
Aug. 31, 2024
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Sep. 30, 2022
Nov. 30, 2021
Rate and Regulatory Matters [Line Items]                          
Approved increase in annual operating revenues                 $ 563,100        
Return on equity                 9.60%        
Reclassification from regulatory liabilities       $ 173,901     $ 173,901   $ 173,901   $ 226,725    
Depreciation             6,309 $ 6,376 18,010 $ 18,546      
Carrying costs                 4,100        
Previously incurred operating treatment costs       1,800     1,800   1,800        
Surcharge for costs incurred           $ 1,400              
Additional cost of purchased water             1,407 2,419 5,019 6,705      
Operations and maintenance expense             $ 25,359 $ 22,581 67,649 $ 64,042      
Annual operating revenue         $ 10,300                
Percentage of current revenue         25.66%                
New Jersey Board of Public Utilities [Member]                          
Rate and Regulatory Matters [Line Items]                          
Reclassification from regulatory liabilities                     $ 48,300    
Depreciation                 900        
Middlesex Water [Member]                          
Rate and Regulatory Matters [Line Items]                          
Escrow account                       $ 1,700  
Middlesex Water [Member] | New Jersey Board of Public Utilities [Member]                          
Rate and Regulatory Matters [Line Items]                          
Approved increase in annual operating revenues $ 15,400                        
Maturity Less than 30 Days [Member] | Middlesex Water Company [Member]                          
Rate and Regulatory Matters [Line Items]                          
Escrow account                         $ 1,700
Tidewater [Member]                          
Rate and Regulatory Matters [Line Items]                          
Additional cost of purchased water       $ 2,100                  
Operations and maintenance expense                 $ 1,700        
Annual revenues     $ 2,500                    
Subsequent Event [Member]                          
Rate and Regulatory Matters [Line Items]                          
Additional cost of purchased water   $ 600                      
Subsequent Event [Member] | Distribution System Improvement Charge [Member]                          
Rate and Regulatory Matters [Line Items]                          
Annual revenues   $ 1,100