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Rate and Regulatory Matters (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2024
Mar. 01, 2024
Jan. 01, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Sep. 30, 2022
Nov. 30, 2021
Rate and Regulatory Matters [Line Items]                
Approved increase in annual operating revenues $ 500              
Base rate amount           $ 563,100    
Return on equity           9.60%    
Reclassification from regulatory liabilities       $ 172,004   $ 226,725    
Depreciation       5,396 $ 5,986      
Carrying costs       3,200        
Prior year costs       1,400        
DISC rate     3.71%          
New Jersey Board of Public Utilities [Member]                
Rate and Regulatory Matters [Line Items]                
Reclassification from regulatory liabilities       48,300        
Depreciation       900        
Tidewater [Member]                
Rate and Regulatory Matters [Line Items]                
DISC rate           7.50%    
Revenue     $ 1,300          
Minimum [Member]                
Rate and Regulatory Matters [Line Items]                
Deferred income, revenue recognized       46,000        
Maximum [Member]                
Rate and Regulatory Matters [Line Items]                
Deferred income, revenue recognized       $ 77,000        
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