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Medical Expenses Payable - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	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

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No definition available.

+ Details

Name:	alhc_ClaimsReserveEstimatesExcludingProvisionFromPriorYearClaimsAndClaimsAdjustmentExpense
Namespace Prefix:	alhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Remaining Claim Amounts Payment Period

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No definition available.

+ Details

Name:	alhc_RemainingClaimAmountsPaymentPeriod
Namespace Prefix:	alhc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration