Equity-Based Compensation - Schedule of Equity-based Compensation Expense on Statement of Operations (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Total equity-based compensation expense | $ 18,174 | $ 15,553 | $ 32,193 | $ 32,740 |
| Income Statement Location: alhc:MedicalExpenses | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Total equity-based compensation expense | 1,893 | 1,594 | 3,304 | 2,746 |
| Income Statement Location: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||||
| Total equity-based compensation expense | $ 16,281 | $ 13,959 | $ 28,889 | $ 29,994 |