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Regulatory Matters: Regulatory Matters: Rural Acquisition (Details) - GOLDEN STATE WATER COMPANY $ in Millions	6 Months Ended
	Jun. 30, 2015 customer	Jun. 30, 2013 USD ($)
Regulatory Assets [Line Items]
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments		$ 1.7
Number of Customers in new service territory | customer	960

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Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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