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Revenue from Contract with Customer - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
WRAM over-collection	$ 64,412	$ 66,404
Revenues	94,728
GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
WRAM over-collection	64,412	$ 66,404
Water Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	67,010
WRAM over-collection	2,598
Revenues	64,412
Electric Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	10,066
BRRAM over-collection	234
Revenues	9,832
Contracted Services | ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	20,484
Tariff-based Revenues | Water Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	65,775
Tariff-based Revenues | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	10,019
Surcharges (Cost-recovery Activities) | Water Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	793
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	47
Other Products and Services | Water Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	442
Water | Contracted Services | ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	13,000
Wastewater | Contracted Services | ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 7,484
Sales | Water Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	90.00%	90.00%
Sales | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	85.00%

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- Definition

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