Asset Sales - Additional Information (Detail) $ in Thousands				3 Months Ended		6 Months Ended
	Dec. 20, 2019 USD ($) a	Sep. 09, 2019 USD ($) a	Oct. 11, 2018 USD ($) a	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Asset Sales [Line Items]
Pre-tax gain on the sale of property				$ 86	$ 452	$ 193	$ 454
Undeveloped Land [Member] | Fulton, MO [Member]
Asset Sales [Line Items]
Undeveloped land sold | a		11.4
Proceeds from sale		$ 348
Pre-tax gain on the sale of property						100
Medical Office Building [Member] | Clanton, AL [Member]
Asset Sales [Line Items]
Undeveloped land sold | a	4
Proceeds from sale	$ 204
Pre-tax gain on the sale of property				$ 86		$ 86
Medical Office Building And Undeveloped Land [Member] | Dahlonega, GA [Member]
Asset Sales [Line Items]
Undeveloped land sold | a			2
Proceeds from sale			$ 935
Pre-tax gain on the sale of property					$ 452		$ 452