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Military Privatization (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 29, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Military Privatization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billings in excess of costs and estimated earnings on contracts |  |  | $ 2,263 | $ 3,911 |  |  |  | $ 2,263 |  |  |  | $ 3,911 | $ 2,263 |  |
Receivables from the U.S. government: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: allowance for doubtful accounts |  |  | (764) | (1,041) |  |  |  | (764) |  |  |  | (1,041) | (764) | $ (944) | $ (892)
Pretax income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in pretax operating income |  |  |  | 21,955 | $ 38,567 | $ 41,816 | $ 24,738 | 22,092 | $ 39,617 | $ 31,774 | $ 21,233 | $ 127,076 | 114,716 | 118,489 |
Military Utility Privatization Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Military Privatization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of fixed price contracts to maintain water systems at various military bases |  |  |  |  |  |  |  |  |  |  |  | 50 years |  |  |
Revenues recognized net of billings to date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues (costs and estimated earnings) recognized on uncompleted contracts |  |  | 104,830 | 78,245 |  |  |  | 104,830 |  |  |  | $ 78,245 | 104,830 |  |
Less: Billings to date |  |  | (43,161) | (15,343) |  |  |  | (43,161) |  |  |  | (15,343) | (43,161) |  |
Total |  |  | 61,669 | 62,902 |  |  |  | 61,669 |  |  |  | 62,902 | 61,669 |  |
Amount included in accompanying balance sheets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs and estimated earnings in excess of billings on uncompleted contracts |  |  | 63,932 | 66,813 |  |  |  | 63,932 |  |  |  | 66,813 | 63,932 |  |
Billings in excess of costs and estimated earnings on uncompleted contracts |  |  | (2,263) | (3,911) |  |  |  | (2,263) |  |  |  | (3,911) | (2,263) |  |
Total |  |  | 61,669 | 62,902 |  |  |  | 61,669 |  |  |  | 62,902 | 61,669 |  |
Receivables from the U.S. government: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Billed receivables from the U.S. government |  |  | 8,467 | 3,725 |  |  |  | 8,467 |  |  |  | 3,725 | 8,467 |  |
Unbilled Contract Receivables, Current |  |  | 6,691 | 7,559 |  |  |  | 6,691 |  |  |  | 7,559 | 6,691 |  |
Pretax income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  | 15,158 | $ 11,284 |  |  |  | $ 15,158 |  |  |  | 11,284 | 15,158 |  |
American States Utility Services [Member] | Military Utility Privatization Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pretax income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in pretax operating income |  |  |  |  |  |  |  |  |  |  |  | $ 21,124 | $ 18,916 | $ 18,091 |
Reportable Legal Entities [Member] | American States Utility Services [Member] | Military Utility Privatization Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Military Privatization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue Recognition, Retrospective Rate-Setting Systems, Amount |  |  | $ 421 |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Maximum | Fort Riley [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Military Privatization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 12 months | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Fort Riley [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Military Privatization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of Transition to Operate and Maintain Water Systems at New Military Base | 6 months | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |

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