Relationship with Parent and Related Entities - New Enviri - Stock-Based Compensation Expense (Details) - Affiliated Entity - New Enviri - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Related Party Transaction [Line Items]
Total Stock-Based Compensation	$ 1,179	$ 2,219
Direct Employees
Related Party Transaction [Line Items]
Total Stock-Based Compensation	328	819
Shared Employees
Related Party Transaction [Line Items]
Total Stock-Based Compensation	$ 851	$ 1,400

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details