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Income Taxes
 9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesAWR's effective income tax rate (“ETR”) was 26.0% and 25.4% for the three months ended September 30, 2021 and 2020, respectively, and was 23.9% and 24.3% for the nine months ended September 30, 2021 and 2020, respectively. GSWC's ETR was 26.0% and 26.7% for the three months ended September 30, 2021 and 2020, respectively, and was 24.0% and 25.5% for the nine months ended September 30, 2021 and 2020, respectively.The AWR and GSWC effective tax rates differed from the federal corporate statutory tax rate of 21% primarily due to (i) state taxes; (ii) permanent differences, including the excess tax benefits from share-based payments, which were reflected in the income statements and resulted in a reduction to income tax expense during the three and nine months ended September 30, 2021 and 2020; (iii) the ongoing amortization of the excess deferred income tax liability; and (iv) differences between book and taxable income that are treated as flow-through adjustments in accordance with regulatory requirements (principally from plant, rate-case, and compensation related items). As a regulated utility, GSWC treats certain temporary differences as flow-through in computing its income tax expense consistent with the income tax method used in its CPUC-jurisdiction ratemaking. Flow-through items either increase or decrease tax expense and thus impact the ETR.