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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Restricted stock based compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock and common stock units and stock options issued by CCA to certain of its employees |  |  | 438,000 |  | 548,000
Fair value of restricted common stock and common stock units and stock options issued by CCA to certain of its employees |  |  | $ 17.5 |  | $ 17.8
Allocated share-based compensation expense | $ 3.7 | $ 3.1 | $ 10.9 | $ 9.0 |
Restricted common stock and common stock units remained outstanding and subject to vesting | 1,000,000 |  | 1,000,000 |  |
Restricted stock based compensation | Officers And Executive Officers |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Performance criteria, cumulative period |  |  | 3 years |  |
Percent of awards eligible to vest |  |  | 33.33% |  |
Restricted stock based compensation | 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 compensation | General and Administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock and common stock units and stock options issued by CCA to certain of its employees |  |  | 385,000 |  | 478,000
Allocated share-based compensation expense | $ 3.4 | 2.7 | $ 9.8 | 7.9 |
Restricted stock based compensation | Operating |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Restricted common stock and common stock units and stock options issued by CCA to certain of its employees |  |  | 53,000 |  | 70,000
Allocated share-based compensation expense | $ 0.3 | 0.4 | $ 1.1 | 1.1 |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Common stock options outstanding | 1,500,000 |  | 1,500,000 |  |
Weighted average exercise price of common stock outstanding | $ 20.32 |  | $ 20.32 |  |
Stock options | General and Administrative |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Expense net of estimated forfeitures, relating to common stock options | $ 0.1 | $ 0.4 | $ 0.6 | $ 1.5 |

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