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Subsequent Event - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 17, 2018
USD ($)
Property
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Subsequent Event [Line Items]          
Asset impairments   $ 1,580 $ 1,580 $ 259  
Crossroads Correctional Center | Scenario Forecast          
Subsequent Event [Line Items]          
Purchase price of real estate         $ 34,100
Management contract expiration date         Jun. 30, 2021
Subsequent Event          
Subsequent Event [Line Items]          
Number of properties acquired | Property 12        
Purchase price of real estate $ 12,000        
Percentage of building leased 100.00%        
Number of properties that may be marketed under portfolio acquisition up to three