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Medical Expenses Payable - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Insurance [Abstract] |  |  |
Remaining claim amounts payment (in years) | 3 years |  |
Favorable prior year development in claims reserve estimates, excluding provision | $ 20,243 | $ 7,052 | $ 10,996

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- 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