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Leases - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) Property State	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Property State	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Jan. 01, 2019 USD ($)
Leases [Line Items]
Number of properties in portfolio | Property	1,005		1,005
Number of states in which our properties are located | State	35		35
Revenues from rental properties	$ 38,263	$ 36,336	$ 75,214	$ 70,986
Rental income contractually due from tenants in revenues from rental properties included in continuing operations	34,366	31,784	67,904	63,178
Revenue recognition adjustments included in revenues from rental properties in continuing operations	383	86	726	156
Real Estate Taxes and other municipal charges paid then reimbursed by tenants included in revenues and expenses	4,280	$ 4,638	8,036	$ 7,964
Net investment in direct financing leases	74,895		74,895		$ 77,238
Net Investments in direct financing lease, lease payments receivable	106,612		106,612		113,256
Net Investment in direct financing lease, unguaranteed estimated residual value	13,928		13,928		13,928
Net Investment in direct financing lease, deferred income	44,727		44,727		49,028
Net Investment in direct financing lease, allowance for credit losses	918		918		918
Operating lease liabilities	24,046		24,046		25,045
Operating lease right of use assets	$ 22,907		$ 22,907		$ 24,319
Accounting Standards Update 2016-13 [Member]
Leases [Line Items]
Net investment in direct financing leases						$ 82,366
Estimated credit loss reserve related to direct financing leases						$ 578
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	54		54
Owned Properties [Member]
Leases [Line Items]
Number of properties | Property	951		951

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Capital leases net investment in direct financing leases allowance for credit losses.

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Estimated credit loss reserve related to direct financing leases.

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The total amount of revenue recognized for the period from operating leases, direct financing leases, above and below market leases and sublease revenue.

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Leases.

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The number of real estate properties in the portfolio, consisting of properties owned and properties leased from third party landlords.

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The number of real estate properties leased from third-party landlords as of the balance sheet date.

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The number of states in which the company's properties, comprised of those that are owned and those that are leased from third party landlords, are located.

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The total of non-cash adjustments recorded for deferred rental revenue due to the recognition of rental income on a straight-line basis over the current lease term, net amortization of above-market and below-market leases, and recognition of rental income recorded under direct financing leases using the effective interest rate method which produces a constant periodic rate of return on the net investments in the leased properties and the amortization of deferred lease incentives.

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The dollar amount of real estate taxes and other municipal charges paid by the company and then reimbursed by tenants included in revenues from rental properties and rental property expenses.

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The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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The remaining (unamortized) difference between the gross investment in a direct financing lease and the cost or carrying amount, if different, of the leased property as of the balance sheet date.

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The estimate of the lease property's economic value at the end of the direct financing lease term excluding any amounts guaranteed by either the lessee or a third-party.

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The number of real estate properties owned as of the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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Amount of undiscounted cash flows to be received by lessor for sales-type and direct financing leases.

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