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General - Additional Information (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Mar. 26, 2015
Jan. 05, 2015
Regulatory Liabilities [Line Items]            
Water reduction target goal (percent)       20.00%    
Mandatory Water Reduction, Percentage 25.00%          
Authorized Regulatory Surcharge, Gross   $ 1,937        
Memorandum Account, Recovery Request         $ 9,567 $ 976
Scenario, Forecast [Member]            
Regulatory Liabilities [Line Items]            
Water reduction target goal (percent)     30.00%