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Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | $ 29,989 | $ 30,822 |
Total utility plant, at cost | 1,839,421 | 1,780,110 |
Less - accumulated depreciation | (543,263) | (561,855) |
Construction work in progress | (119,547) | (78,055) |
Net utility plant | 1,415,705 | 1,296,310 | $ 1,204,992
American States Utility Services [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 571 | 571 |
Water Service Utility Operations [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,730,996 | 1,674,046 |
Water Service Utility Operations [Member] | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 18,066 | 14,890 |
Water Service Utility Operations [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 28,578 | 29,412 |
Water Service Utility Operations [Member] | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 91,685 | 91,349 |
Water Service Utility Operations [Member] | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 178,058 | 182,673 |
Water Service Utility Operations [Member] | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 78,048 | 82,198 |
Water Service Utility Operations [Member] | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,219,285 | 1,142,105 |
Water Service Utility Operations [Member] | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 117,276 | 131,419 |
Electric: |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 108,425 | 106,064 |
Electric: | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,200 | 1,200 |
Electric: | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 84,018 | 82,257 |
Electric: | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,583 |
Electric: | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 11,824 | 11,224 |
GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | 29,418 | 30,251 |
Total utility plant, at cost | 1,808,867 | 1,755,599 |
Less - accumulated depreciation | (531,801) | (551,244) |
Construction work in progress | (117,676) | (76,737) |
Net utility plant | 1,394,742 | 1,281,092 |
GSWC | Water Service Utility Operations [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,700,442 | 1,649,535 |
Net utility plant | 1,322,062 | 1,218,468 | 1,137,995
GSWC | Water Service Utility Operations [Member] | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 18,066 | 14,890 |
GSWC | Water Service Utility Operations [Member] | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 28,578 | 29,413 |
GSWC | Water Service Utility Operations [Member] | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 91,685 | 91,349 |
GSWC | Water Service Utility Operations [Member] | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 178,058 | 182,673 |
GSWC | Water Service Utility Operations [Member] | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 78,048 | 82,198 |
GSWC | Water Service Utility Operations [Member] | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,219,285 | 1,142,105 |
GSWC | Water Service Utility Operations [Member] | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 86,722 | 106,907 |
GSWC | Electric: |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 108,425 | 106,064 |
Net utility plant | 72,680 | 62,624 | $ 59,945
GSWC | Electric: | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 84,018 | 82,257 |
GSWC | Electric: | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,583 |
GSWC | Electric: | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 11,824 | 11,224 |
Conservation [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | 9,486 | 9,486 |
Conservation [Member] | GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total amortized intangible assets | $ 9,486 | $ 9,486 |

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