Regulatory Matters (Details 5) (GSWC, USD $)	1 Months Ended	12 Months Ended
	May 23, 2013	Dec. 31, 2013	Dec. 31, 2012
Regulatory matters:
Total		$ 122,681,000	$ 176,015,000
Pension and other post-retirement obligations
Regulatory matters:
Regulatory asset		15,200,000
Number of water regions for which two-way balancing account was established		3
Total		20,241,000	56,894,000
Pension and other post-retirement obligations | Two-way pension balancing account
Regulatory matters:
Regulatory asset		5,100,000
Base revenue requirement adjustment mechanism
Regulatory matters:
Period of surcharge approved		12 months
Increase in revenue requirement recoverable through surcharges collected	2,300,000	1,800,000
Total		8,725,000	6,833,000
Low income rate assistance balancing accounts
Regulatory matters:
Commercial paper, term		90 days
Increase in revenue requirement recoverable through surcharges collected		1,200,000
Discount percentage for qualified low-income water customers		15.00%
Discount percentage for qualified low-income electric customers		20.00%
Total		$ 9,979,000	$ 9,119,000