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Regulatory Matters - Schedule of Regulatory Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved $ (11,238) $ (22,796)
GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved (10,057) (24,082)
GSWC | Various refunds to customers    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved (5,481) (2,680)
BVESI | Various refunds to customers    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved (8,772) (8,189)
Water Revenue Adjustment Mechanism and Modified Cost Balancing Account | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved 24,115 13,326
Pensions and other post-retirement obligations (Note 8) | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved 24,633 25,212
COVID-19 memorandum accounts | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved 5,593 1,663
Excess deferred income taxes | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved (72,531) (73,000)
Flow-through taxes, net | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved (4,347) (5,552)
Other regulatory assets | GSWC    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved 17,961 16,949
Other regulatory assets | BVESI    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved 15,705 13,916
Derivative unrealized gain (Note 5) | BVESI    
Schedule of Regulatory Assets and Liabilities [Line Items]    
Capital expenditure approved $ (8,114) $ (4,441)