Subsequent Events (Details) (USD $) In Millions, unless otherwise specified			0 Months Ended
	Sep. 30, 2013 acre_foot	Dec. 31, 2012 acre_foot	Nov. 06, 2013 Subsequent Event Pacific acre_foot	Nov. 06, 2013 Subsequent Event Pacific Maximum	Nov. 06, 2013 Common Stock Subsequent Event Pacific
Subsequent Event [Line Items]
Long-term Water Assets (Volume)	41,690	40,770	6,693
Cost of Purchased Water			$ 18.70
Stock Valuation, Weighted Average Price, Threshold Consecutive Trading Days					10 days
Optional renewal term			35 years
Cost of Purchased Water, Area			656
Annual fee rate increase				3.00%