Sale of Assets - Additional Information (Detail) $ in Thousands		1 Months Ended	12 Months Ended
	Jan. 11, 2018 USD ($)	Dec. 31, 2016 USD ($) Buildings	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Income Statement Equity Method Investments [Line Items]
Proceeds from sale			$ 0	$ 14,621
Gain on sale of properties			(460)	$ 4,647
Ellijay, GA [Member]
Income Statement Equity Method Investments [Line Items]
Number of building sold | Buildings		3
Medical Office Building Complex [Member] | Ellijay, GA [Member]
Income Statement Equity Method Investments [Line Items]
Proceeds from sale		$ 4,900
Gain on sale of properties		$ 2,804
Carmichael's Cashway Pharmacy, Inc [Member]
Income Statement Equity Method Investments [Line Items]
Proceeds from sale	$ 410
Earnings (Loss) before income taxes			$ 183