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Medical Expenses Payable - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025
Insurance [Abstract] |  |
Remaining claim amounts payment period |  | 3 years
Claims reserve estimates, excluding provision | $ 5,091 | $ 17,586

X
- Definition Claims reserve estimates, excluding provision from prior year claims and claims adjustment expense. + References No definition available. + Details
Name: | alhc_ClaimsReserveEstimatesExcludingProvisionFromPriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | alhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Remaining claim amounts payment period. + References No definition available. + Details
Name: | alhc_RemainingClaimAmountsPaymentPeriod
Namespace Prefix: | alhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration