Discontinued Operations and Environmental Incident - Additional Information (Detail)			1 Months Ended	12 Months Ended
	Feb. 10, 2017	Jan. 31, 2017 Subsidiary	Nov. 30, 2019 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 31, 2021 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Costs incurred related to environmental remediation				$ 79,000	$ 112,000
Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration]				Costs and Expenses	Costs and Expenses
Environmental remediation liability				$ 402,000	$ 406,000
Income tax expense (benefit)				898,000	774,000
Environmental Incident 1994 [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Environmental remediation				4,000	160,000
Sale of Petroleum Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sharing arrangement percentage	20.00%
Actual cost of the project			$ 427,000
Maximum additional obligation			$ 104,000
Loss from discontinued operations includes remediation costs					160,000
Legal Fees				30,000	189,000
Income tax expense (benefit)				$ (6,000)	$ (94,000)
Terminal [Member] | Sale of Petroleum Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of wholly owned subsidiaries | Subsidiary		2
Terminal [Member] | Sale of Petroleum Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Estimate of possible loss						$ 427,000