Leases - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2022 USD ($) Property State	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)	Jan. 01, 2019 USD ($)
Leases [Line Items]
Number of properties in portfolio | Property	1,039
Number of states in which our properties are located | State	38
Revenues from rental properties	$ 163,889,000	$ 153,886,000	$ 144,601,000
Rental income contractually due from tenants in revenues from rental properties included in continuing operations	149,098,000	138,691,000	128,246,000
Revenue recognition adjustments included in revenues from rental properties in continuing operations	1,948,000	1,964,000	895,000
Real Estate Taxes and other municipal charges paid then reimbursed by tenants included in revenues and expenses		16,739,000	17,159,000	$ 17,250,000
Net investment in direct financing leases	66,185,000	71,647,000
Net Investments in direct financing lease, lease payments receivable	85,336,000	98,539,000
Net Investment in direct financing lease, unguaranteed estimated residual value	13,928,000	13,928,000
Net Investment in direct financing lease, deferred income	32,184,000	39,994,000
Net Investment in direct financing lease, allowance for credit losses	(895,000)	(826,000)
Net Investment in direct financing lease, additional allowance for credit losses	895,000,000	826,000,000
Operating lease liabilities	19,959,000	22,980,000
Operating lease right of use assets	18,193,000	$ 21,092,000
Remaining lease term		8 years
Operating leases future minimum payments due, current		$ 4,285,000,000
Operating leases future minimum payments due in two year		3,641,000,000
Operating leases future minimum payments due in three year		2,851,000,000
Operating leases future minimum payments due in four year		2,495,000,000
Operating leases future minimum payments due in five year		1,829,000,000
Thereafter		5,708,000,000
Rent expense on operating lease	2,877,000,000	3,393,000,000	3,769,000,000
Rent received under sublease	6,400,000,000	7,333,000,000	7,892,000,000
Accounting Standards Update 2016-13 [Member]
Leases [Line Items]
Estimated credit loss reserve related to direct financing leases					$ 578,000
Additional allowance for credit losses			$ 340,000,000
Accounting Standards Update 2016-02 [Member]
Leases [Line Items]
Operating lease liabilities						$ 25,561,000
Operating lease right of use assets						$ 26,087,000
Other Income [Member]
Leases [Line Items]
Net Investment in direct financing lease, additional allowance and a reduction for credit losses	$ 69,000,000	$ 92,000,000
Third Party Landlords [Member]
Leases [Line Items]
Number of properties leased | Property	42
Owned Properties [Member]
Leases [Line Items]
Number of properties | Property	997