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v3.3.1.900

Bank Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Short-term borrowing activities (excluding letters of credit) |  |
Balance outstanding at the end of the period | $ 28,000,000 | $ 0
Syndicated revolving credit facility |  |
Bank debt |  |
Increase in additional aggregate bank commitments | $ 50,000,000.0 |
Variable rate basis | Euro rate |
Syndicated revolving credit facility | Minimum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Interest coverage ratio | 325.00% |
Syndicated revolving credit facility | Maximum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Total funded debt ratio | 65.00% |
Letters of credit | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] |  |
Bank debt |  |
Letter of credit, amount | $ 15,000,000 |
AWR |  |
Bank debt |  |
Maximum borrowing capacity | 100,000,000.0 |
Short-term borrowing activities (excluding letters of credit) |  |
Balance outstanding at the end of the period | 28,000,000 | $ 0
AWR | Syndicated revolving credit facility |  |
Bank debt |  |
Increase in additional aggregate bank commitments | $ 50,000,000.0 |
Short-term borrowing activities (excluding letters of credit) |  |
Interest coverage ratio | 768.00% |
Total funded debt ratio | 44.00% |
AWR | Syndicated revolving credit facility | Minimum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Interest coverage ratio | 325.00% |
AWR | Syndicated revolving credit facility | Maximum |  |
Short-term borrowing activities (excluding letters of credit) |  |
Total funded debt ratio | 65.00% |
AWR | Syndicated revolving credit facility | Letters of credit |  |
Bank debt |  |
Maximum borrowing capacity | $ 25,000,000 |
Letter of credit, amount | $ 10,400,000 |
Letter of credit fee (as a percent) | 0.65% |

X
- Definition Represents the funded debt ratio required to be maintained for debt instrument. + References No definition available. + Details
Name: | awr_DebtInstrumentCovenantFundedDebtRatio
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the interest coverage ratio required to be maintained for debt instrument. + References No definition available. + Details
Name: | awr_DebtInstrumentCovenantInterestCoverageRatio
Namespace Prefix: | awr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the maximum amount of additional bank commitments the entity may elect to increase under terms of the debt agreement. + References No definition available. + Details
Name: | awr_LineOfCreditFacilityElectiveMaximumAdditionalBorrowingCapacity
Namespace Prefix: | awr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
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Namespace Prefix: | awr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

X
- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1),20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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