Environmental Matters - Additional Information (Detail) |
6 Months Ended |
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Jun. 30, 2025
USD ($)
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| Environmental Restoration Costs | |
| Site Contingency [Line Items] | |
| Estimated Costs Accrued For Remediation | $ 5,600,000 |
| Fitchburg Manufactured Gas Plant Site [Member] | |
| Site Contingency [Line Items] | |
| remediation costs | 3,500,000 |
| Fitchburg Manufactured Gas Plant Site [Member] | Environmental Restoration Costs | |
| Site Contingency [Line Items] | |
| Estimated Costs Accrued For Remediation | $ 40,000 |
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- Definition Amount, before recovery, of expense for known and estimated future costs arising from requirement to perform environmental remediation. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Remediation costs No definition available.
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