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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Provision for income tax		$ 280,000	$ 228,000	$ 767,000	$ 710,000
Percentage of rental income excluded from accounting standard adoption				94.00%
Percentage of total revenue subject to revenue recognition standard				6.00%
Accounting Standards Update 2016-02 [Member] \| Maximum [Member]
Expected right of use assets and related lease liabilities to opening balance sheet adoption of new accounting standard on leases				$ 300,000,000
Adjustments for New Accounting Principle, Early Adoption
Gain (loss) on equity transaction	$ 0
Federal [Member]
Provision for income tax				$ 0

A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.

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