Regulatory Matters (Details 9) (GSWC, USD $)			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2012 BVES General Rate Case	Dec. 31, 2013 BVES General Rate Case	Dec. 31, 2012 Renewables Portfolio Standard	Dec. 31, 2013 Renewables Portfolio Standard renewable_energy
Regulatory matters:
Amount of retroactive ratemaking proposal included in DRA's recommendation to increase accumulated depreciation			$ 2,000,000
Portion of deferred rate case cost borne by shareholders				50.00%
Net regulatory assets	$ 122,681,000	$ 176,015,000		$ 1,800,000
Portion of deferred rate case costs required to be written off, if DRA prevails				50.00%
Agreement period to purchase renewable energy credits					10 years
Number of renewable energy credits that would be purchased						582,000