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Contingencies - Additional Information (Detail) | Feb. 16, 2017 | Feb. 15, 2017 USD ($) | Jan. 31, 2017 Member | Jun. 08, 2016 Relator | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 23, 2012 Member | Jan. 13, 2012 Finding | Jul. 14, 2008 Employee | Apr. 10, 2008 Claim | Mar. 05, 2008 Claim
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Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrual for legal fees and settlements |  |  |  |  | $ 34,500,000 | $ 2,700,000 |  |  |  |  |
Number of OIG Findings | Finding |  |  |  |  |  |  |  | 3 |  |  |
Number of documentation of attendance of students enrolled in CTU's | Finding |  |  |  |  |  |  |  | 1 |  |  |
Number of calculation of returns of Title IV Program funds | Finding |  |  |  |  |  |  |  | 1 |  |  |
Surrett [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of alleged claims for equitable relief | Claim |  |  |  |  |  |  |  |  |  |  | 2
Number of claims added for money damages | Claim |  |  |  |  |  |  |  |  |  | 2 |
Number of individuals WCI file motion to compel arbitration | Member |  |  |  |  |  |  | 1,062 |  |  |  |
Surrett [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of individuals in decertified class | Member |  |  | 1,000 |  |  |  |  |  |  |  |
False Claims Act [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrual for legal fees and settlements |  |  |  |  | 32,000,000 |  |  |  |  |  |
Number of former employees who filed complaint | Employee |  |  |  |  |  |  |  |  | 4 |  |
Number of relators | Relator |  |  |  | 4 |  |  |  |  |  |  |
Number of relators not having for incentive compensation claim | Relator |  |  |  | 3 |  |  |  |  |  |  |
False Claims Act [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement agreement date |  | February 15, 2017 |  |  |  |  |  |  |  |  |
Case dismissal date | Feb. 16, 2017 |  |  |  |  |  |  |  |  |  |
False Claims Act [Member] | Subsequent Event [Member] | Relators Claims for Attorney’s Fees and Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount |  | $ 22,000,000 |  |  |  |  |  |  |  |  |
False Claims Act [Member] | Subsequent Event [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement amount |  | $ 10,000,000 |  |  |  |  |  |  |  |  |
OIG Audit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Potential liability related to audit |  |  |  |  | $ 1,000,000 |  |  |  |  |  |

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