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Business Combinations - Additional Information (Detail) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 07, 2019 USD ($) Facility Bed | Dec. 01, 2018 USD ($) State | Jan. 02, 2018 USD ($) State | Sep. 30, 2020 USD ($) | Dec. 31, 2018 Transaction
Business Acquisition [Line Items] |  |  |  |  |
Number of purchase price transactions | Transaction |  |  |  |  | 2
Rocky Mountain Offender Management Systems, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of states in which company facilities are located | State |  |  | 7 |  |
Aggregate purchase price |  |  | $ 7.0 |  |
Recovery Monitoring Solutions Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of states in which company facilities are located | State |  | 4 |  |  |
Aggregate purchase price |  | $ 15.9 |  |  |
Rehabilitation Services Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate purchase price | $ 4.4 |  |  |  |
Loss on settlement of contingent consideration |  |  |  | $ (0.6) |
Number of additional facilities | Facility | 2 |  |  |  |
Number of additional home confinement facilities | Facility | 34 |  |  |  |
Rehabilitation Services Inc | Ghent Residential Reentry Center |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of beds at the center | Bed | 36 |  |  |  |
Rehabilitation Services Inc | James River Residential Reentry Center |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of beds at the center | Bed | 84 |  |  |  |

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