Equity Plans (Tables) |
12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2025 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Share-Based Payment Arrangement [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan | A summary of compensation costs charged to income and proceeds from share-based compensation, which are recorded to additional paid-in capital and common stock, by award type, are presented below for the years ended December 31:
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| Schedule of Restricted and Deferred Restricted Stock Awards | A summary of H2O America’s outstanding restricted and deferred restricted stock awards under the Plan as of December 31, 2025, and changes during the year ended December 31, 2025, are presented below:
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| Schedule of Nonvested Restricted Stock Units Activity | A summary of the status of H2O America’s nonvested restricted and deferred restricted stock awards under the plans as of December 31, 2025, and changes during the year ended December 31, 2025, are presented below:
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