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Revenue - Schedule of Utilities Operating Revenue Expense Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue From Contract With Customer [Abstract]
Utility-related taxes	$ 19,696	$ 18,700

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- Definition

Public Utility Operating Expenses Excise Taxes Collected and Reported Gross in Revenues and Operating Expenses

+ References

No definition available.

+ Details

Name:	ava_PublicUtilityOperatingExpensesExciseTaxesCollected
Namespace Prefix:	ava_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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