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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 |  |  |  |

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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