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Schedule III - Real Estate Assets and Accumulated Depreciation Summary of Transactions (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule III, Real Estate Assets and Accumulated Depreciation [Line Items] |  |  |  |
Investment in Real Estate, balance at beginning of period | $ 3,595,278 |  | $ 3,605,137 | $ 3,697,160
Additions through capital expenditures | 27,217 |  | 29,142 | 64,423
Acquisitions |  |  | 82,324 | 8,809
Asset impairments | (3,335) |  | (10,154) | (4,040)
Disposals/Other | (266,218) |  | (111,171) | (161,215)
Investment in Real Estate, balance at end of period | 3,352,942 | [1] | 3,595,278 | 3,605,137
Accumulated Depreciation, balance at beginning of period | (1,128,563) |  | (1,053,670) |
Depreciation | (81,693) |  | (89,008) | (87,492)
Disposals/Other | 16,205 |  | 14,115 | 109,211
Accumulated Depreciation, balance at end of period | $ (1,194,051) | [2] | $ (1,128,563) | $ (1,053,670)
[1] | The aggregate cost of properties for federal income tax purposes is approximately $3.7 billion at December 31, 2021.
[2] | Depreciation is calculated using estimated useful lives of depreciable assets up to 50 years for prison facilities.

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- Definition Amount of accumulated depreciation pertaining to real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column F)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount, before accumulated depreciation, of real estate investment by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. Excludes real estate not held as investment or interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Column E)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of increase in real estate investments related to improvements for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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- Definition Amount of increase in real estate investments from acquisitions other than through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
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