Long-Term Debt (Details) - USD ($)		12 Months Ended
	May 24, 2021	Dec. 31, 2022	Jan. 13, 2023	Dec. 31, 2021
Debt Instrument [Line Items]
Ratio of Indebtedness to EBITDA		8
GSWC
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital		0.4568
Ratio of Indebtedness to EBITDA		4.2
Maximum borrowing capacity		$ 130,000,000
GSWC | Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital		0.6667
BVESI
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 35,000,000
Notes Payable 9.56 Percent Due 2031 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 28,000,000
Interest rate (as a percent)	9.56%
Debt Instrument, Redemption Price, Percentage	3.00%
Redemption Price Of Debt Instrument	$ 840,000
5.87% notes due 2028
Debt Instrument [Line Items]
Interest rate (as a percent)		5.87%		5.87%
5.87% notes due 2028 | GSWC
Debt Instrument [Line Items]
Interest rate (as a percent)		5.87%		5.87%
3.45% notes due 2029
Debt Instrument [Line Items]
Interest rate (as a percent)		3.45%		3.45%
3.45% notes due 2029 | GSWC
Debt Instrument [Line Items]
Interest rate (as a percent)		3.45%		3.45%
Private Placement Notes | GSWC
Debt Instrument [Line Items]
Debt Instrument Redemption Premium above Treasury Yield		50.00%
2.17% notes due 2030
Debt Instrument [Line Items]
Interest rate (as a percent)		2.17%		2.17%
2.17% notes due 2030 | GSWC
Debt Instrument [Line Items]
Interest rate (as a percent)		2.17%		2.17%
2.90% notes due 2040
Debt Instrument [Line Items]
Interest rate (as a percent)		2.90%		2.90%
2.90% notes due 2040 | GSWC
Debt Instrument [Line Items]
Interest rate (as a percent)		2.90%		2.90%
Series A Senior Notes 5.12 Percent Due 2033 | GSWC | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 100,000,000
Interest rate (as a percent)			5.12%
Series A Senior Notes 5.22 Percent Due 2038 | GSWC | Subsequent Event
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 30,000,000
Interest rate (as a percent)			5.22%