Environmental Matters - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2023	Mar. 31, 2024	Dec. 31, 2022
Site Contingency [Line Items]
Amortization period for environmental costs		5 years
remediation costs			$ 5.6
Environmental Restoration Costs
Site Contingency [Line Items]
Estimated Costs Accrued For Remediation			$ 2.5
Fitchburg Manufactured Gas Plant Site [Member]
Site Contingency [Line Items]
Estimated Costs Accrued For Remediation	$ 40,000.0
remediation costs	$ 3.5