| Schedule of changes in the carrying amounts of goodwill by reportable segment |
| | | | | | | | | | | | Water | | Water | | | | | | Infrastructure | | Services | | Total | | | | (in thousands) | Balance as of December 31, 2025 | | $ | 47,047 | | $ | 1,438 | | $ | 48,485 | Additions | | | — | | | — | | | — | Balance as of March 31, 2026 | | $ | 47,047 | | $ | 1,438 | | $ | 48,485 |
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| Summary of components of other intangible assets |
| | | | | | | | | | | | | | | | | | | | | As of March 31, 2026 | | As of December 31, 2025 | | | Gross | | Accumulated | | Net | | Gross | | Accumulated | | Net | | | Value | | Amortization | | Value | | Value | | Amortization | | Value | | | | (in thousands) | | (in thousands) | Definite-lived | | | | | | | | | | | | | | | | | | | Customer relationships | | $ | 187,230 | | $ | (95,456) | | $ | 91,774 | | $ | 187,230 | | $ | (91,596) | | $ | 95,634 | Patents and other intellectual property | | | 14,272 | | | (10,444) | | | 3,828 | | | 14,272 | | | (10,060) | | | 4,212 | Water rights | | | 1,925 | | | (809) | | | 1,116 | | | 1,750 | | | (673) | | | 1,077 | Total definite-lived | | | 203,427 | | | (106,709) | | | 96,718 | | | 203,252 | | | (102,329) | | | 100,923 | Indefinite-lived | | | | | | | | | | | | | | | | | | | Water rights | | | 5,281 | | | — | | | 5,281 | | | 5,281 | | | — | | | 5,281 | Total indefinite-lived | | | 5,281 | | | — | | | 5,281 | | | 5,281 | | | — | | | 5,281 | Total other intangible assets, net | | $ | 208,708 | | $ | (106,709) | | $ | 101,999 | | $ | 208,533 | | $ | (102,329) | | $ | 106,204 |
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