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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Common stock options outstanding | 700,000 |  | 700,000 |  |
Weighted average exercise price per share of common stock outstanding | $ 20.17 |  | $ 20.17 |  |
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 |  |  | $ 20.5 |  | $ 18.1
Allocated share-based compensation expense | $ 2.3 | $ 4.1 | $ 9.8 | $ 12.2 |
Restricted common stock units remained outstanding and subject to vesting | 1,200,000 |  | 1,200,000 |  |
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 |  |  | 945,000 |  | 554,000
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 Expense |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 1.9 | 3.6 | $ 8.4 | 10.7 |
Restricted stock based awards | General and Administrative Expense | 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 |  |  | 850,000 |  | 487,000
Restricted stock based awards | Operating Expense |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Allocated share-based compensation expense | $ 0.4 | $ 0.5 | $ 1.4 | $ 1.5 |
Restricted stock based awards | Operating Expense | Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock units issued by CoreCivic |  |  | 95,000 |  | 67,000

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