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Goodwill - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 Facility | Mar. 31, 2017 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) Facility | Dec. 31, 2016 USD ($)
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Establishment of goodwill |  |  |  | This goodwill was established in connection with multiple business combination transactions. |
Goodwill |  |  |  | $ 40,927,000 | $ 38,386,000
Goodwill impairment charges |  |  |  | 0 |
State of Texas |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 0 |
Number of facilities scheduled to expire in August 2017 | Facility |  |  |  | 4 |
Number of facilities for which TDCJ selected other operators | Facility | 3 |  |  |  |
Bartlett State Jail |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill impairment charges |  | $ 300,000 |  |  |
Closing date of Bartlett facility |  |  |  | Jun. 24, 2017 |
Winn Correctional Center |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |
Goodwill impairment charges |  |  | $ 1,000,000 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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