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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

X

- 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

X

- References

No definition available.

+ Details

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