Leases - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) Property State	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Property State	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2019 USD ($)
Leases [Line Items]
Number of properties in portfolio | Property	1,024		1,024
Number of states in which our properties are located | State	38		38
Revenues from rental properties	$ 40,814	$ 38,263	$ 79,797	$ 75,214
Rental income contractually due from tenants in revenues from rental properties included in continuing operations	37,175	34,366	73,600	67,904
Revenue recognition adjustments included in revenues from rental properties in continuing operations	449	383	1,025	726
Real Estate Taxes and other municipal charges paid then reimbursed by tenants included in revenues and expenses	4,088	$ 4,280	7,223	$ 8,036
Net investment in direct financing leases	69,048		69,048		$ 71,647
Net Investments in direct financing lease, lease payments receivable	91,963		91,963		98,539
Net Investment in direct financing lease, unguaranteed estimated residual value	13,928		13,928		13,928
Net Investment in direct financing lease, deferred income	36,017		36,017		39,994
Net Investment in direct financing lease, allowance for credit losses	826		826		826
Operating lease liabilities	21,622		21,622		22,980
Operating lease right of use assets	$ 19,773		$ 19,773		$ 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	45		45
Owned Properties [Member]
Leases [Line Items]
Number of properties | Property	979		979