Environmental Commitments and Contingencies - Additional Information (Detail) |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2026
USD ($)
site
|
Dec. 31, 2025
USD ($)
|
|
| Environmental Commitments And Contingencies [Line Items] | ||
| Company's exposure in number of former Manufactured Gas Plant Sites | site | 7 | |
| Environmental liabilities | $ 3,000,000.0 | $ 2,900,000 |
| Seaford [Member] | Minimum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Estimated costs of remediation range, minimum | 300,000 | |
| Seaford [Member] | Maximum [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Estimated costs of remediation range, minimum | 800,000 | |
| Manufactured Gas Plant [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Regulatory Assets for future recovery of environmental costs | 200,000 | |
| FPU [Member] | ||
| Environmental Commitments And Contingencies [Line Items] | ||
| Environmental liabilities | $ 3,300,000 | $ 3,100,000 |