Short-Term Borrowing - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Oct. 31, 2023	Sep. 30, 2023	Dec. 31, 2022 USD ($)
Short-term Debt [Line Items]
Short-term borrowings			$ 179,853,000			$ 202,157,000
Number Of Unsecured Bank Credit Facilities			3
Short-term Debt, Weighted Average Interest Rate, at Point in Time			5.83%			5.04%
Ratio of Indebtedness to Net Capital				0.70	0.65
Long-term debt including current maturities			$ 1,200,000,000			$ 600,800,000
Line of Credit Facility, Commitment Fee Percentage			9500.00%
Line of Credit Facility, Remaining Borrowing Capacity			$ 188,100,000
Notional Amount of Nonderivative Instruments	$ 40,000,000	$ 60,000,000	$ 50,000,000
Fixed Swap Rate	0.17%
Debt Instrument, Interest Rate, Stated Percentage			6.54%
Amount of letter of credit to our current primary insurance company			$ 7,000,000
Florida City Gas | Regulated Energy [Member]
Short-term Debt [Line Items]
Bridge Loan			965,000,000
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Aggregate Borrowing Capacity			$ 375,000,000
Interest Rate Swap Rate, Low Range [Member]
Short-term Debt [Line Items]
Fixed Swap Rate		0.20%
Interest Rate Swap Rate, High Range [Member]
Short-term Debt [Line Items]
Fixed Swap Rate			3.98%
Revolving Line of Credit, Short-term
Short-term Debt [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			7500.00%
Debt Instrument, Fee			9
Aggregate Investment, Maximum			$ 175,000,000			$ 150,000,000
Ownership Interest			0.50
Interest Rate Credit Adjustment			10
Line Of Credit Facility Interest Rate Description 2			$ 0.0005
Line Of Credit Facility Interest Rate Description 1			$ 0.01
Line of Credit Facility, Interest Rate Description			1.05 percent
Revolving Line of Credit, Long-term
Short-term Debt [Line Items]
Debt Instrument, Fee			9
Interest Rate Credit Adjustment			10