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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Common stock options outstanding | 0.5 |  | 0.5 |  |
Weighted average exercise price per share of common stock outstanding | $ 22.13 |  | $ 22.13 |  |
Restricted stock based awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Fair value of restricted common stock units issued by CoreCivic to certain of its employees and non-employee directors |  |  | $ 20.9 |  | $ 20.1
Vesting description |  |  | The RSUs awarded to officers and executive officers in 2019 and 2020 consist of a combination of awards with performance-based conditions and time-based conditions. Unless earlier vested under the terms of the RSU agreements, the RSUs with time-based vesting conditions vest evenly generally on the first, second, and third anniversary of the award. The RSUs with performance-based vesting conditions are divided into one-third increments, each of which is subject to vesting based upon satisfaction of certain annual performance criteria established at the beginning of the fiscal years ending December 31, 2019, 2020, and 2021 for the 2019 awards, and December 31, 2020, 2021, and 2022 for the 2020 awards, and which can be increased by up to 150% or decreased to 0% based on performance relative to the annual performance criteria, and further increased or decreased using a modifier of 80% to 120% based on CoreCivic's total shareholder return relative to a peer group. Because the performance criteria for the fiscal years ending December 31, 2021 and 2022 have not yet been established, the values of the third RSU increment of the 2019 awards and of the second and third increments of the 2020 awards for financial reporting purposes will not be determined until such criteria are established. |  |
Increase in vesting percentage based on performance relative to annual performance criteria |  |  | 150.00% |  |
Decrease in vesting percentage based on performance relative to annual performance criteria |  |  | 0.00% |  |
Allocated share-based compensation expense | $ 4.1 | $ 4.6 | $ 13.0 | $ 12.7 |
Restricted common stock units remained outstanding and subject to vesting | 2.0 |  | 2.0 |  |
Restricted stock based awards | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Increase decrease in vesting percentage based on shareholder return relative to peer group |  |  | 80.00% |  |
Restricted stock based awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Increase decrease in vesting percentage based on shareholder return relative to peer group |  |  | 120.00% |  |
Restricted stock based awards | General and Administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 3.7 | 4.2 | $ 11.7 | 11.3 |
Restricted stock based awards | Operating |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 0.4 | $ 0.4 | $ 1.3 | $ 1.4 |
Restricted stock based awards | Employees And Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock units issued by CoreCivic |  |  | 1.2 |  | 0.9
Restricted stock based awards | Employees And Non Employee Directors | General and Administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock units issued by CoreCivic |  |  | 1.1 |  | 0.8
Restricted stock based awards | Employee | Operating |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock units issued by CoreCivic |  |  | 0.1 |  | 0.1
Restricted stock based awards | Officers And Executive Officers |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Percent of awards eligible to vest |  |  | 33.33% |  |
Restricted stock based awards | Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Vesting period |  |  | 1 year |  |
Restricted stock based awards | Other Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Vesting period, continuous service requirement |  |  | 3 years |  |

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