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Revenues - Assets and Liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Unbilled receivable | $ 24,481 | $ 23,516
ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Unbilled receivable | 10,518 | 9,693
Receivable from the U.S. government | 90,330 | 91,489
Contract assets | 19,063 | 14,378
Contract liabilities | 1,239 | $ 1,352
Revenue, remaining performance obligation, amount | $ 4,000,000 |
ASUS | Maximum |  |
Disaggregation of Revenue [Line Items] |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 50 years |

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