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Regulatory Matters: (Details 3) (GSWC, USD $)
 6 Months Ended 3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
General rate case memorandum accounts
item
Dec. 31, 2012
General rate case memorandum accounts
Mar. 31, 2013
Other regulatory assets, net
Jun. 30, 2013
Other regulatory assets, net
Dec. 31, 2012
Other regulatory assets, net
Regulatory matters:              
Regulatory assets $ 184,893,000 $ 176,015,000 $ 17,239,000 $ 4,495,000   $ 40,393,000 $ 40,332,000
Number of water regions     3        
Increase (decrease) to net regulatory assets due to settlement of rate case during the period     $ 13,100,000   $ 3,200,000