Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Property State	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2019 USD ($)
Leases [Line Items]
Number of properties in portfolio | Property	1,093
Number of states in which our properties are located | State	40
Revenues from rental properties	$ 180,488	$ 163,889	$ 153,886
Rental income contractually due from tenants in revenues from rental properties included in continuing operations	163,000	149,100	138,700
Revenue non-cash adjustments included in revenues from rental properties in continuing operations	0	1,900	2,000
Real Estate Taxes and other municipal charges paid then reimbursed by tenants included in revenues and expenses	19,500	16,700	17,200
Net Investment in direct financing lease, additional allowances (reductions) for credit losses	800	900
Net investment in direct financing leases	59,964	66,185
Net Investments in direct financing lease, lease payments receivable	71,834	85,336
Net Investment in direct financing lease, unguaranteed estimated residual value	13,928	13,928
Net Investment in direct financing lease, deferred income	24,995	32,184
Net Investment in direct financing lease, allowance for credit losses	(803)	(895)
Operating lease liabilities	16,051	19,959
Operating lease right of use assets	$ 14,571	18,193
Remaining lease term	8 years
Operating leases future minimum payments due, current	$ 3,600
Operating leases future minimum payments due in two year	2,800
Operating leases future minimum payments due in three year	2,500
Operating leases future minimum payments due in four year	1,900
Operating leases future minimum payments due in five year	1,500
Thereafter	4,300
Rent expense on operating lease	2,400	2,900	3,400
Rent received under sublease	5,800	6,400	7,300
Accounting Standards Update 2016-13 [Member]
Leases [Line Items]
Net Investment in direct financing lease, additional allowances (reductions) for credit losses	$ (92)	$ 69	$ (92)
Accounting Standards Update 2016-02 [Member]
Leases [Line Items]
Operating lease liabilities				$ 25,600
Operating lease right of use assets				$ 26,100
Third Party Landlords [Member]
Leases [Line Items]
Number of properties leased | Property	37
Owned Properties [Member]
Leases [Line Items]
Number of properties | Property	1,056