Environmental Obligations - Additional Information (Detail) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2022	Jul. 31, 2012	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
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					$ 0		$ 23,543,000
Amount of credits to environmental expenses					78,000	$ 17,534,000
Unknown reserve liabilities					11,167,000
Environmental remediation obligations			$ 22,917,000		22,917,000		23,155,000
Accretion expense					278,000	822,000
Increase in carrying value of property					$ 1,681,000	1,194,000
Estimated maximum remaining useful life of underground storage tanks used to calculate depreciation of capitalized asset retirement costs		10 years			10 years
Depreciation and amortization expense for capitalized asset retirement costs					$ 1,488,000	1,946,000
Capitalized asset retirement costs			33,535,000		33,535,000		33,213,000
Impairments			2,462,000	$ 391,000	2,984,000	1,429,000
Pollution legal liability insurance policy duration	5 years
Pollution legal liability insurance policy aggregate limit		$ 50,000,000			25,000,000
Capitalized Asset Retirement Costs [Member]
Other Commitments [Line Items]
Impairments					1,339,000	735,000
Property Previously Disposed [Member]
Other Commitments [Line Items]
Amount of credits to environmental expenses					26,000	$ 1,749,000
Reasonably Estimable Environmental Remediation Obligation [Member]
Other Commitments [Line Items]
Environmental remediation obligation known reserve liabilities			10,502,000		10,502,000		10,797,000
Future Environmental Liabilities for Preexisting Unknown Contamination [Member]
Other Commitments [Line Items]
Environmental remediation obligation unknown reserve liabilities			12,415,000		12,415,000		12,358,000
Capitalized asset retirement costs			8,470,000		8,470,000		8,471,000
Known Environmental Liabilities [Member]
Other Commitments [Line Items]
Capitalized asset retirement costs			$ 25,065,000		$ 25,065,000		$ 24,742,000
Minimum [Member]
Other Commitments [Line Items]
Environmental remediation liabilities discount rate			4.00%		4.00%
Environmental remediation liability inflation rate adjustment					2.00%
Maximum [Member]
Other Commitments [Line Items]
Environmental remediation liabilities discount rate			7.00%		7.00%
Environmental remediation liability inflation rate adjustment					2.75%