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Taxes on Income (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Taxes on income      
Unrecognized Tax Benefits $ 0    
Interest Expense 21,088,000 $ 21,617,000 $ 22,415,000
Deferred tax assets:      
Regulatory-liability-related: ITC and excess deferred taxes 952,000 1,001,000  
Regulatory-liability-related: California Corp Franchise Tax 4,530,000 4,328,000  
Other nonproperty-related 2,486,000 2,395,000  
Contributions and advances 8,026,000 8,335,000  
Deferred tax assets 15,994,000 16,059,000  
Deferred tax liabilities:      
Fixed assets (178,004,000) (163,232,000)  
Regulatory-asset-related: depreciation and other (21,658,000) (22,941,000)  
Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax (2,440,000) (4,069,000)  
Other nonproperty-related (66,000) (59,000)  
Balancing and memorandum accounts (1,824,000) (4,071,000)  
Deferred charges (4,849,000) (5,461,000)  
Deferred tax liabilities (208,841,000) (199,833,000)  
Accumulated deferred income taxes - net (192,847,000) (183,774,000)  
Current      
Federal 21,866,000 5,595,000 13,741,000
State 5,442,000 137,000 5,930,000
Total current tax expense 27,308,000 5,732,000 19,671,000
Deferred      
Federal 8,948,000 24,815,000 14,769,000
State 1,475,000 7,501,000 1,343,000
Total deferred tax expense 10,423,000 32,316,000 16,112,000
Reconciliations of the effective tax rates to the federal statutory rate      
Federal taxes on pretax income at statutory rate 34,375,000 34,687,000 34,464,000
Flow-through on removal costs (1,560,000) (643,000) (2,944,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount (88,000) (91,000) (91,000)
Income tax expense/(benefit) 37,731,000 38,048,000 35,783,000
Pretax income from continuing operations $ 98,215,000 $ 99,106,000 $ 98,469,000
Effective income tax rate (as a percent) 38.40% 38.40% 36.30%
Increase (decrease) in taxes resulting from: $ 4,843,000 $ 4,781,000 $ 5,111,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount 626,000 651,000 646,000
Income Tax Reconciliation Flow Through on Pension Costs 267,000 (507,000) 612,000
Income Tax Reconciliation Cost of Removal (929,000) (1,571,000) (2,141,000)
Income Tax Examination, Penalties Accrued 0 0 0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 197,000 741,000 126,000
Income Tax Examination, Penalties Expense 0 0 0
Tax Authorities      
Taxes on income      
Net interest receivable 504,000 504,000 757,000
Recognized interest income 0 19,000 99,000
AWR Parent      
Reconciliations of the effective tax rates to the federal statutory rate      
Income tax expense/(benefit) (810,000) (996,000) (2,262,000)
Pretax income from continuing operations 59,674,000 60,062,000 60,424,000
GSWC      
Taxes on income      
Interest Expense 20,998,000 21,524,000 22,287,000
Deferred tax assets:      
Regulatory-liability-related: ITC and excess deferred taxes 952,000 1,001,000  
Regulatory-liability-related: California Corp Franchise Tax 4,530,000 4,328,000  
Other nonproperty-related 1,997,000 2,136,000  
Contributions and advances 8,026,000 8,335,000  
Deferred tax assets 15,505,000 15,800,000  
Deferred tax liabilities:      
Fixed assets (179,660,000) (164,724,000)  
Regulatory-asset-related: depreciation and other (21,658,000) (22,941,000)  
Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax (3,051,000) (4,831,000)  
Other nonproperty-related (65,000) (59,000)  
Balancing and memorandum accounts (1,824,000) (4,071,000)  
Deferred charges (4,905,000) (5,461,000)  
Deferred tax liabilities (211,163,000) (202,087,000)  
Accumulated deferred income taxes - net (195,658,000) (186,287,000)  
Current      
Federal 16,196,000 408,000 10,768,000
State 5,557,000 (2,754,000) 6,315,000
Total current tax expense 21,753,000 (2,346,000) 17,083,000
Deferred      
Federal 8,536,000 24,373,000 14,691,000
State 2,183,000 9,979,000 1,360,000
Total deferred tax expense 10,719,000 34,352,000 16,051,000
Reconciliations of the effective tax rates to the federal statutory rate      
Federal taxes on pretax income at statutory rate 28,022,000 27,952,000 28,622,000
Flow-through on removal costs (1,268,000) (55,000) (1,316,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount (88,000) (91,000) (91,000)
Income tax expense/(benefit) 32,472,000 32,006,000 33,134,000
Pretax income from continuing operations $ 80,063,000 $ 79,863,000 $ 81,776,000
Effective income tax rate (as a percent) 40.60% 40.10% 40.50%
Increase (decrease) in taxes resulting from: $ 5,151,000 $ 4,693,000 $ 5,372,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount 626,000 651,000 646,000
Income Tax Reconciliation Flow Through on Pension Costs 267,000 (507,000) 612,000
Income Tax Reconciliation Cost of Removal (929,000) (1,571,000) (2,141,000)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 691,000 934,000 1,430,000
GSWC | Tax Authorities      
Taxes on income      
Net interest receivable 512,000 472,000 704,000
Interest Expense 3,000    
Recognized interest income   $ 14,000 $ 21,000
Tax Year 2013 [Member]      
Taxes on income      
Deferred Tax Liabilities Related to Repair-And-Maintenance Deductions $ 30,800,000