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Revenue from Contract with Customer (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Contract liability revenue recognized | $ 3.4 |  | $ 3.7 |
Performance obligation remaining | 0.0 |  | $ 0.0 |
Registration payment arrangement period |  |  | 20 days |
Golden State Water Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Reimbursement Revenue | $ 1.0 | $ 1.0 | $ 2.8 | $ 2.8
Contracted Services | American States Utility Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Period of fixed price contracts to operate and maintain the water and/or wastewater systems at various military bases |  |  | 50 years |
Sales | Water Service Utility Operations | Golden State Water Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of concentration risk |  |  | 90.00% |
Sales | Electric Service Utility Operations | Golden State Water Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of concentration risk |  |  | 90.00% |
Minimum | American States Utility Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligation fulfillment period |  |  | 36 years |
Maximum | American States Utility Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Performance obligation fulfillment 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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