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Business Combinations - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 12 Months Ended
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Nov. 01, 2017 USD ($) Facility Bed | Jun. 01, 2017 USD ($) Bed | Apr. 08, 2016 USD ($) Facility Bed Entity Lease | Aug. 27, 2015 Facility | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Facility Bed | Dec. 31, 2017 USD ($) Transaction | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Bed
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities acquired | Facility |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 440,576,000 | $ 442,845,000 | $ 436,393,000 | $ 445,684,000 | $ 464,134,000 | $ 474,935,000 | $ 463,331,000 | $ 447,385,000 |  | $ 1,765,498,000 | $ 1,849,785,000 | $ 1,793,087,000
Number of purchase price transactions | Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Revolving Credit Facility | $900.0 Million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  | $ 900,000,000 |  |  |  | $ 900,000,000 |  |  |  |  | $ 900,000,000 | $ 900,000,000 |
Avalon Correctional Services, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of acquired stock |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00%
Number of additional facilities | Facility |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Number of facilities acquired | Facility |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |
Number of beds at the center | Bed |  |  |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  | 3,000
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  | $ 157,500,000 |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |
Avalon Correctional Services, Inc | Revolving Credit Facility | $900.0 Million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 900,000,000 |  |  | $ 900,000,000
Avalon Correctional Services, Inc | The achievement of certain utilization milestones over 12 months following the acquisition | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due under earn-outs business combinations |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  | 2,000,000
Avalon Correctional Services, Inc | The completion of and transition to a newly constructed facility that delivers the contracted services provided at the Dallas Transitional Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts due under earn-outs business combinations |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,500,000 |  |  | $ 5,500,000
Correctional Management, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of acquired stock |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities acquired | Facility |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds at the center | Bed |  |  | 600 |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 35,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities affiliated | Entity |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities | Facility |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities leased | Lease |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Correctional Management, Inc | Revolving Credit Facility | $900.0 Million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowing capacity |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Center Point, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds at the center | Bed |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 5,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Center Point, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination consideration excluding transaction related expense and potential earn-out |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time to Change, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of beds at the center | Bed | 422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities | Facility | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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