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Regulatory Matters (Details 4) (GSWC, USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2005 | Jul. 31, 2005 | Dec. 31, 2013
Costs deferred for future recovery on Aerojet case |  |  |
Regulatory matters: |  |  |
Increase in revenue requirement recoverable through surcharges collected |  | $ 21.3 |
Recovery periods | 20 years | 20 years |
Reimbursement to recover costs |  |  | 17.5
Costs deferred for future recovery on Aerojet case | Maximum |  |  |
Regulatory matters: |  |  |
Recovery periods | 20 years |  |
Water Revenue Adjustment Mechanism Net of Modified Cost Balancing Account [Member] |  |  |
Regulatory matters: |  |  |
Amount billed to customers as surcharges |  |  | $ 26.5

X
- Definition Represents the amount of increase in revenue requirement for difference between the allocated general office costs authorized by the CPUC November 2010 Decision and what was then in rates for allocated general office costs. + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Represents amount billed to customers as surcharges. + References No definition available. + Details
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Namespace Prefix: | awr_
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- Definition Represents the recovery periods of the surcharge billed to the customers. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Details
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Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653 + Details
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