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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Common stock options outstanding | 1,000,000 |  | 1,000,000 |  |
Weighted average exercise price of common stock outstanding | $ 19.92 |  | $ 19.92 |  |
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 |  |  | $ 18.1 |  | $ 18.5
Allocated share-based compensation expense | $ 4.1 | $ 6.2 | $ 12.2 | $ 13.9 |
Restricted common stock units remained outstanding and subject to vesting | 1,000,000 |  | 1,000,000 |  |
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 |  |  | 554,000 |  | 635,000
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 | Other Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Vesting period, continuous service requirement |  |  | 3 years |  |
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 | General and Administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 3.6 | 4.1 | $ 10.7 | 10.9 |
Restricted stock based awards | General and Administrative | 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 |  |  | 487,000 |  | 562,000
Restricted stock based awards | Operating |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 0.5 | 0.4 | $ 1.5 | 1.3 |
Restricted stock based awards | Operating | Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock units issued by CoreCivic |  |  | 67,000 |  | 73,000
Restricted stock based awards | Restructuring Charges |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense |  | $ 1.7 |  | $ 1.7 |

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