Leases - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) Property State	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2019 USD ($)
Leases [Line Items]
Number of properties in portfolio | Property	1,014
Number of states in which our properties are located | State	38
Revenues from rental properties	$ 38,984	$ 36,951
Rental income contractually due from tenants in revenues from rental properties included in continuing operations	36,425	33,539
Revenue recognition adjustments included in revenues from rental properties in continuing operations	576	343
Real Estate Taxes and other municipal charges paid then reimbursed by tenants included in revenues and expenses	3,135	$ 3,756
Net investment in direct financing leases	70,376		$ 71,647
Net Investments in direct financing lease, lease payments receivable	95,262		98,539
Net Investment in direct financing lease, unguaranteed estimated residual value	13,928		13,928
Net Investment in direct financing lease, deferred income	37,988		39,994
Net Investment in direct financing lease, allowance for credit losses	826		826
Operating lease liabilities	22,313		22,980
Operating lease right of use assets	$ 20,431		$ 21,092
Accounting Standards Update 2016-02 [Member]
Leases [Line Items]
Operating lease liabilities				$ 26,087
Operating lease right of use assets				$ 25,561
Third Party Landlords [Member]
Leases [Line Items]
Number of properties leased | Property	46
Owned Properties [Member]
Leases [Line Items]
Number of properties | Property	968