Medical Expenses Payable - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2022 USD ($)
Insurance [Abstract]
Claims reserve estimates, excluding provision	$ 5,875
Remaining claim amounts payment period	3 years

Claims reserve estimates, excluding provision from prior year claims and claims adjustment expense.

No definition available.

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