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Capitalization - Narrative (Details)
$ / shares in Units, gal in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 12, 2025
USD ($)
Sep. 30, 2025
USD ($)
shares
May 31, 2024
USD ($)
loan
Sep. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
project
$ / shares
shares
gal
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2025
USD ($)
Oct. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Apr. 30, 2023
shares
Class of Stock [Line Items]                      
Value of common shares issued       $ 16,992,000 $ 3,604,000            
Number of shares approved to issue and sell (in shares) | shares                     1,000,000.0
Total net proceeds from shares issued and sold under agreement           $ 21,281,000 $ 740,000        
Debt drawn down           3,603,000 592,000        
Loans Payable | New Jersey SRF                      
Class of Stock [Line Items]                      
Borrowing amount   $ 300,000,000.0   300,000,000.0   300,000,000.0   $ 300,000,000.0      
Maximum petitioned borrowing amount approved   260,000,000.0   260,000,000.0   260,000,000.0   260,000,000.0      
Loans Payable | September 2024 Delaware SRF | Tidewater                      
Class of Stock [Line Items]                      
Borrowing amount             $ 2,200,000        
Interest rate             0.00%        
Debt drawn down               1,700,000      
Loans Payable | May 2024 Delaware SRF | Tidewater                      
Class of Stock [Line Items]                      
Borrowing amount     $ 5,600,000                
Interest rate     2.00%                
Debt drawn down           900,000          
Number of debt instruments | loan     4                
Loans Payable | 2023 Delaware SRF | Tidewater                      
Class of Stock [Line Items]                      
Debt drawn down           $ 7,200,000          
Number of active construction projects funded by debt instruments | project           2          
Carrying amount of debt   8,300,000   8,300,000   $ 8,300,000   8,300,000      
Size of elevated storage tank (in gallons) | gal           1          
Loans Payable | Amortizing Secured Notes And State Revolving Trust Notes                      
Class of Stock [Line Items]                      
Carrying amount of debt   230,500,000   230,500,000   $ 230,500,000   230,500,000   $ 229,800,000  
Loans Payable | Construction Advances                      
Class of Stock [Line Items]                      
Carrying amount of debt   $ 24,100,000   $ 24,100,000   $ 24,100,000   24,100,000   $ 22,600,000  
Secured Debt | 5.99% FMBs due 2055 | Subsequent Event                      
Class of Stock [Line Items]                      
Borrowing amount                 $ 30,000,000    
Interest rate                 5.99%    
Underwritten Public Offering and/or ATM Offering                      
Class of Stock [Line Items]                      
Maximum number of shares petitioned to issue and sell during offering (in shares) | shares   2,500,000                  
ATM Equity Sales Agreement                      
Class of Stock [Line Items]                      
Aggregate gross sales price $ 110,000,000.0                    
Number of shares issued and sold under agreement (in shares) | shares       316,786   380,741          
Weighted average price per share of shares issued and sold under agreement (in dollars per share) | $ / shares       $ 53.47   $ 54.10          
Total net proceeds from shares issued and sold under agreement       $ 16,700,000   $ 20,300,000          
Aggregate gross sales price of shares remaining to be issued under agreement   $ 89,400,000   $ 89,400,000   $ 89,400,000   $ 89,400,000      
Common Stock                      
Class of Stock [Line Items]                      
Number of common shares issued (in shares) | shares       317,000 64,000 12,522 13,498        
Value of common shares issued       $ 16,992,000 $ 3,604,000 $ 700,000 $ 700,000