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Environmental Obligations - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Jul. 31, 2012 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Other Commitments [Line Items] |  |  |  |  |  |  |
Remediation agreement of lease |  |  |  |  | we agreed to be responsible for environmental contamination that was known at the time the lease commenced, and for unknown environmental contamination which existed prior to commencement of the lease and which is discovered (other than as a result of a voluntary site investigation) during the first 10 years of the lease term (or a shorter period for a minority of such leases) (a “Lookback Period”) |  |
The maximum number of years during lease term during which contamination is discovered that the Company may be responsible for |  |  |  |  | 10 years |  |
Lookback Period |  |  |  |  | 5 years |  |
Unknown reserve liabilities removed |  |  |  |  | $ 24,200,000 |  |
Amount of credits to environmental expenses |  |  |  |  | 800,000 | $ 200,000 |
Unknown reserve liabilities |  |  |  |  | 11,800,000 |  |
Environmental remediation obligations |  |  | $ 20,812,000 |  | 20,812,000 |  | $ 22,369,000
Accretion expense |  |  |  |  | 299,000 | 422,000 |
Changes in environmental estimates |  |  |  |  | 100 | 40,000 |
Increase in carrying value of property |  |  |  |  | $ 1,900,000 | 3,200,000 |
Estimated maximum remaining useful life of underground storage tanks used to calculate depreciation of capitalized asset retirement costs |  |  |  |  | 10 years |  |
Depreciation and amortization expense for capitalized asset retirement costs |  |  |  |  | $ 2,000,000 | 2,200,000 |
Capitalized asset retirement costs |  |  | 33,600,000 |  | 33,600,000 |  | 34,300,000
Impairments |  |  | 675,000 | $ 986,000 | 2,467,000 | 3,970,000 |
Pollution legal liability insurance policy duration | 5 years | 10 years |  |  |  |  |
Pollution legal liability insurance policy aggregate limit |  | $ 50,000,000 |  |  | 25,000,000 |  |
Capitalized Asset Retirement Costs [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Impairments |  |  |  |  | 1,600,000 | $ 2,300,000 |
Reasonably Estimable Environmental Remediation Obligation [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Environmental remediation obligation known reserve liabilities |  |  | 9,000,000 |  | 9,000,000 |  | 9,900,000
Future Environmental Liabilities for Preexisting Unknown Contamination [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Environmental remediation obligation unknown reserve liabilities |  |  | 11,800,000 |  | 11,800,000 |  | 12,500,000
Capitalized asset retirement costs |  |  | 8,200,000 |  | 8,200,000 |  | 8,500,000
Known Environmental Liabilities [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Capitalized asset retirement costs |  |  | $ 25,400,000 |  | $ 25,400,000 |  | $ 25,800,000

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