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Real Estate and Related Assets - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 USD ($) | Dec. 31, 2020 USD ($) Property Facility | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Number of real estate properties owned | Property |  | 69 |  |
Number of properties for lease to third parties and used by government agencies | Property |  | 15 |  |
Number of facilities owned by government partners, managed | Facility |  | 5 |  |
Interest capitalization cost on construction in progress |  | $ 500,000 | $ 6,000,000.0 | $ 1,000,000.0
Depreciation expense |  | $ 141,700,000 | 137,700,000 | $ 152,000,000.0
Number of facilities subject to options | Facility |  | 10 |  |
Number of facilities accounting for as service concession arrangements | Facility |  | 4 |  |
Other real estate assets |  | $ 228,243,000 | 238,637,000 |
Purchase price paid for real property in addition to bonds value | $ 100 |  |  |
Contract Cost |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Other real estate assets |  | 143,600,000 | 147,800,000 |
Service Contract |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Other real estate assets |  | $ 84,600,000 | $ 90,800,000 |
Development Authority of Telfair County |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Percentage of property tax abatement | 90.00% |  |  |
Percentage of property tax abatement, decrease in percentage | (10.00%) |  |  |
Principal amount of bond issued | $ 15,000,000.0 |  |  |
Number of years of tax abatement | 9 years |  |  |

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