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Utility Plant and Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | $ 1,620,325 | $ 1,527,537 |
Less - accumulated depreciation | (532,753) | (529,698) |
Construction work in progress | (63,354) | (62,955) |
Net utility plant | 1,150,926 | 1,060,794 | $ 1,003,520
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 |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,526,316 | 1,439,056 |
Water | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 15,393 | 15,299 |
Water | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 36,291 | 34,848 |
Water | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 86,775 | 86,914 |
Water | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 169,983 | 161,668 |
Water | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 74,980 | 72,238 |
Water | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,014,925 | 941,651 |
Water | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 127,969 | 126,438 |
Electric |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 94,009 | 88,481 |
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 | 71,112 | 66,121 |
Electric | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,563 |
Electric | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 10,314 | 9,797 |
GSWC |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,608,428 | 1,516,505 |
Less - accumulated depreciation | (524,927) | (522,749) |
Construction work in progress | (61,810) | (62,360) |
Net utility plant | 1,145,311 | 1,056,116 |
GSWC | Water |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,514,419 | 1,428,024 |
Net utility plant | 1,089,031 | 1,005,114 | 953,678
GSWC | Water | Land |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 15,393 | 15,299 |
GSWC | Water | Intangible Assets [Member] |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 36,273 | 34,830 |
GSWC | Water | Source of water supply |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 86,775 | 86,914 |
GSWC | Water | Pumping |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 169,983 | 161,668 |
GSWC | Water | Water treatment |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 74,980 | 72,238 |
GSWC | Water | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 1,014,925 | 941,651 |
GSWC | Water | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 116,090 | 115,424 |
GSWC | Electric |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 94,009 | 88,481 |
Net utility plant | 56,280 | 51,002 | $ 45,202
GSWC | Electric | Transmission and distribution |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 71,112 | 66,121 |
GSWC | Electric | Generation |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | 12,583 | 12,563 |
GSWC | Electric | General |  |  |
Utility plant utilized in continuing operations by major asset class |  |  |
Total utility plant, at cost | $ 10,314 | $ 9,797 |

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