XML 93 R49.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Regulatory Matters (Details 6) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2010 | Sep. 30, 2013 | Dec. 31, 2014
General rate case memorandum accounts |  |  |  |
Regulatory matters: |  |  |  |
Effect of retroactive increase in rate | $ 600,000 awr_EffectofRetroactiveIncreaseinRate / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember | $ 4,100,000 awr_EffectofRetroactiveIncreaseinRate / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember |  |
GSWC |  |  |  |
Regulatory matters: |  |  |  |
Net regulatory assets | 122,681,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember |  |  | 125,704,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember
GSWC | General rate case memorandum accounts |  |  |  |
Regulatory matters: |  |  |  |
Net regulatory assets | $ 15,645,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember |  |  | $ 4,731,000 us-gaap_NetRegulatoryAssets / dei_LegalEntityAxis = awr_GoldenStateWaterCompanyMember / us-gaap_RegulatoryAssetAxis = awr_GeneralRateCaseMemorandumAccountsMember
Regulatory Asset Recovery Periods |  |  | 12 months |
Minimum | GSWC | General rate case memorandum accounts |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  |  | 12 months |
Maximum | GSWC | General rate case memorandum accounts |  |  |  |
Regulatory matters: |  |  |  |
Regulatory Asset Recovery Periods |  |  | 24 months |

X
- Definition Effect of Retroactive Increase in Rate + References No definition available. + Details
Name: | awr_EffectofRetroactiveIncreaseinRate
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the recovery periods of the surcharge billed to the customers. + References No definition available. + Details
Name: | awr_RegulatoryAssetRecoveryPeriods
Namespace Prefix: | awr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | awr_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=awr_GoldenStateWaterCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RegulatoryAssetAxis=awr_GeneralRateCaseMemorandumAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |