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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets        
Cash and equivalents $ 75,988us-gaap_CashAndCashEquivalentsAtCarryingValue $ 38,226us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,486us-gaap_CashAndCashEquivalentsAtCarryingValue  
Deferred tax assets 7,435us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 9,553us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent    
Income taxes receivable and other receivables 20,993us-gaap_IncomeTaxesReceivable 9,214us-gaap_IncomeTaxesReceivable    
Total current assets 209,451us-gaap_AssetsCurrent 191,617us-gaap_AssetsCurrent    
Other assets 12,105us-gaap_OtherAssetsNoncurrent 14,227us-gaap_OtherAssetsNoncurrent    
Total Assets 1,378,298us-gaap_Assets 1,310,183us-gaap_Assets 1,280,943us-gaap_Assets  
Income taxes payable 638us-gaap_TaxesPayableCurrent 507us-gaap_TaxesPayableCurrent    
Liabilities and Capitalization        
Other 99,290us-gaap_LiabilitiesCurrent 100,906us-gaap_LiabilitiesCurrent    
Deferred taxes 191,209us-gaap_DeferredTaxLiabilitiesNoncurrent 159,506us-gaap_DeferredTaxLiabilitiesNoncurrent    
Other 446,409us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent 390,794us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent    
Common shareholders' equity 506,801us-gaap_StockholdersEquity 492,404us-gaap_StockholdersEquity 454,579us-gaap_StockholdersEquity 408,666us-gaap_StockholdersEquity
Total capitalization 832,599us-gaap_CapitalizationLongtermDebtAndEquity 818,483us-gaap_CapitalizationLongtermDebtAndEquity    
Total Capitalization and Liabilities 1,378,298us-gaap_LiabilitiesAndStockholdersEquity 1,310,183us-gaap_LiabilitiesAndStockholdersEquity    
AWR        
Assets        
Cash and equivalents 31,629us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
107us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Inter-company loan receivables 1,445us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
21,113us-gaap_DueFromRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred tax assets 503us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
388us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income taxes receivable and other receivables 44us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,733us-gaap_IncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total current assets 33,621us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
23,341us-gaap_AssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investments in subsidiaries 478,677us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
468,568us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 4,948us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,364us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Assets 517,246us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
495,273us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Due to Related Parties, Current 0us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
500us-gaap_DueToRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income taxes payable 9,902us-gaap_TaxesPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,851us-gaap_TaxesPayableCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Liabilities and Capitalization        
Deferred taxes and other liabilities 154awr_DeferredTaxesAndOtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
84awr_DeferredTaxesAndOtherLiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 10,056us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,435us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Deferred taxes 100us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
146us-gaap_DeferredTaxLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Income taxes payable and other liabilities 289awr_AccruedIncomeTaxesAndOtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
288awr_AccruedIncomeTaxesAndOtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other 389us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
434us-gaap_LiabilitiesOtherThanLongtermDebtNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Common shareholders' equity 506,801us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
492,404us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total capitalization 506,801us-gaap_CapitalizationLongtermDebtAndEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
492,404us-gaap_CapitalizationLongtermDebtAndEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Capitalization and Liabilities $ 517,246us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 495,273us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember