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Organization, Summary of Significant Accounting Policies and Recent Developments (Narrative) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2015
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]            
Percent voting interest       50.00%    
Percent of operating revenues       88.00%    
Percent of total assets       99.00%    
Allowance for doubtful accounts   $ 0.8   $ 0.8 $ 0.7  
Bad debt expense       0.8 0.7 $ 0.7
Write-offs       $ 0.6 $ 0.6 $ 0.9
Pinelands Water [Member]            
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]            
Originally filed increase in annual operating revenue   0.3        
Pinelands Wastewater [Member]            
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]            
Originally filed increase in annual operating revenue   0.2        
Twin Lakes [Member]            
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]            
Originally filed increase in annual operating revenue $ 0.2 $ 0.2        
New Jersey Board of Public Utilities [Member]            
Organization, Summary Of Significant Accounting Policies And Recent Developments [Line Items]            
Approved increase in annual operating revenues     $ 5.0