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Schedule III - Real Estate Assets and Accumulated Depreciation (Parenthetical) (Detail) $ in Billions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2015 Bed | Jun. 10, 2016 Bed | Aug. 27, 2015 Bed
SEC Schedule III, Real Estate Assets and Accumulated Depreciation [Line Items] |  |  |  |
Aggregate cost of properties for federal Income Tax purposes | $ | $ 3.6 |  |  |
Number of beds at the facility |  |  | 112 | 600
San Diego Correctional Facility |  |  |  |
SEC Schedule III, Real Estate Assets and Accumulated Depreciation [Line Items] |  |  |  |
Number of beds at the facility |  | 1,154 |  |
Lease expiration date |  | Dec. 31, 2015 |  |
Otay Mesa Detention Center |  |  |  |
SEC Schedule III, Real Estate Assets and Accumulated Depreciation [Line Items] |  |  |  |
Number of beds at the facility |  | 1,482 |  |
Maximum |  |  |  |
SEC Schedule III, Real Estate Assets and Accumulated Depreciation [Line Items] |  |  |  |
Prison facilities, estimated useful lives of depreciable assets | 50 years |  |  |

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