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Investment in Affiliate - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments In And Advances To Affiliates [Line Items] |  |  |
Duration of prison management contract with an agency of the United Kingdom government | 25 years |  |
Working capital loan to APM | $ 3,000,000.0 |  |
Equity earnings (losses) of joint venture | (128,000) | $ (100,000) | $ (62,000)
Other assets |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Equity in net earnings of Affiliate | $ 38,000 |  |
Agecroft Prison Management Ltd |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |
Variable interest entity, ownership percentage | 50.00% |  |

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