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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes and Interest Paid:
Income taxes paid	$ 15,984us-gaap_IncomeTaxesPaidNet	$ 10,880us-gaap_IncomeTaxesPaidNet	$ 19,411us-gaap_IncomeTaxesPaidNet
Interest paid	22,236us-gaap_InterestPaid	22,144us-gaap_InterestPaid	22,495us-gaap_InterestPaid
Non-Cash Transactions:
Accrued payables for investment in utility plant	13,147us-gaap_CapitalExpendituresIncurredButNotYetPaid	19,515us-gaap_CapitalExpendituresIncurredButNotYetPaid	12,113us-gaap_CapitalExpendituresIncurredButNotYetPaid
Property installed by developers and conveyed	800us-gaap_ContributionOfProperty	2,819us-gaap_ContributionOfProperty	2,069us-gaap_ContributionOfProperty
GSWC
Taxes and Interest Paid:
Income taxes paid	16,500us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	7,083us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	11,027us-gaap_IncomeTaxesPaidNet / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Interest paid	22,184us-gaap_InterestPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	22,144us-gaap_InterestPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	22,495us-gaap_InterestPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Non-Cash Transactions:
Accrued payables for investment in utility plant	13,141us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	19,515us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	12,113us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
Property installed by developers and conveyed	$ 800us-gaap_ContributionOfProperty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	$ 2,819us-gaap_ContributionOfProperty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember	$ 2,069us-gaap_ContributionOfProperty / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember

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