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Revenue from Contract with Customer (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Contract with Customer, Liability, Revenue Recognized | $ 2,600 |  | $ 1,900 |
Revenue, Remaining Performance Obligation | 0 |  | $ 0 |
Registration Payment Arrangement, Term |  |  | 20 days |
Golden State Water Company [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Cost of Reimbursable Expense | $ 894 | $ 937 | $ 1,700 | $ 1,800
Contracted Services [Member] | American States Utility Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases |  |  | 50 years |
Sales [Member] | Water Service Utility Operations [Member] | Golden State Water Company [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage |  |  | 90.00% |
Sales [Member] | Electric Service Utility Operations [Member] | Golden State Water Company [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage |  |  | 85.00% |
Minimum [Member] | American States Utility Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 36 years |
Maximum [Member] | American States Utility Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period |  |  | 50 years |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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