Employee Benefit Expenses - Schedule of the accumulated benefit obligation (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Defined Benefit Plan, Roll Forwards [Abstract] | ||||||
| Service cost | $ 43 | $ 125 | $ 83 | $ 246 | ||
| Interest cost | $ 175 | $ 182 | 345 | 357 | ||
| HMH Holding BV And Subsidiaries [Member] | ||||||
| Defined Benefit Plan, Roll Forwards [Abstract] | ||||||
| Beginning balance | 18,436 | 18,458 | $ 18,458 | $ 20,174 | ||
| Service cost | 163 | 492 | ||||
| Interest cost | 749 | 764 | ||||
| Actuarial (gain) loss | (1,740) | 124 | ||||
| Benefits paid | (1,457) | (1,419) | ||||
| Foreign currency translation adjustment | 2,354 | (1,589) | ||||
| Other | (91) | (88) | ||||
| Ending balance | 18,436 | 18,458 | ||||
| Beginning of year | $ 0 | $ 0 | 0 | 0 | ||
| Employer contribution | 734 | 712 | ||||
| Benefits paid | (643) | (624) | ||||
| End of year | 0 | 0 | ||||
| Funded status—End of year | (18,436) | (18,458) | ||||
| Accumulated benefit obligation | $ (18,436) | $ (18,458) | ||||
| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other. No definition available.
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| X | ||||||||||
- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Details
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