SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT - Note Payable to Banks Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)	Apr. 22, 2022 USD ($)	Dec. 31, 2021 USD ($)
Note payable to banks
Notes payable to bank	$ 255,500		$ 31,000
Net working capital	(245,200)
Revolving Credit Facility
Note payable to banks
Notes payable to bank	$ 255,500
Maximum | Syndicated Revolving Credit Facility
Note payable to banks
Total funded debt ratio	0.65
Maximum | Revolving Credit Facility
Note payable to banks
Line of credit facility, current borrowing capacity		$ 280,000
Minimum | Syndicated Revolving Credit Facility
Note payable to banks
Interest coverage ratio	3.25
AWR
Note payable to banks
Notes payable to bank	$ 255,500		$ 0
Line of credit facility, current borrowing capacity		200,000
AWR | Syndicated Revolving Credit Facility
Note payable to banks
Interest coverage ratio	6.32
Total funded debt ratio	0.51
AWR | Syndicated Revolving Credit Facility | Letters of credit
Note payable to banks
Maximum borrowing capacity	$ 25,000
Letter of credit, amount	$ 639
Letter of credit fee (as a percent)	0.65%
AWR | Maximum
Note payable to banks
Line of credit facility, current borrowing capacity		$ 280,000
AWR | Maximum | Syndicated Revolving Credit Facility
Note payable to banks
Total funded debt ratio	1.00
AWR | Minimum | Syndicated Revolving Credit Facility
Note payable to banks
Interest coverage ratio	3.25
Total funded debt ratio	0.65