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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  |  |  |  | 3 Months Ended |  | 12 Months Ended |  |  | 1 Months Ended |  |  |  | 1 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended |
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Mar. 31, 2013 Plaintiff Person | Dec. 31, 2012 | Jan. 13, 2012 Findings | May 03, 2012 Ross [Member] Defendant | Mar. 31, 2013 Vasquez [Member] Claim | Aug. 10, 2012 Vasquez [Member] Person Agreement | Jun. 15, 2012 Vasquez [Member] Claim | Sep. 30, 2012 Code of Civil Procedure [Member] Plaintiff | Mar. 31, 2013 Amador [Member] Plaintiff LawSuits | Sep. 27, 2007 Amador [Member] Plaintiff | Dec. 31, 2010 Lilley [Member] Student | Mar. 31, 2013 Lilley [Member] Plaintiff | Oct. 25, 2012 Lilley [Member] Plaintiff | Apr. 22, 2011 Surrett [Member] Student | May 23, 2012 Surrett [Member] Members | Apr. 10, 2008 Surrett [Member] Claim | Mar. 05, 2008 Surrett [Member] Claim | Sep. 16, 2011 Gonzalez case [Member] Student | Jan. 18, 2013 Coleman case [Member] Person | Jun. 03, 2011 Abarca [Member] Person | Jun. 15, 2011 Andrade [Member] Person | Aug. 12, 2011 Aprieto [Member] Person | Mar. 31, 2013 Amador and California Education Code [Member] Complaints | Jul. 14, 2008 False Claims Act Lawsuit [Member] Employees | Mar. 31, 2013 Gonzalez [Member] Plaintiff | Mar. 31, 2013 OIG Audit [Member] | Dec. 31, 2012 OIG Audit [Member] | Mar. 31, 2013 Stafford [Member] Claim | Feb. 28, 2013 Stafford [Member]
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for legal fees and settlements | $ 5,800,000 | $ 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of executive officers as defendants |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of student plaintiffs | 1,000 |  |  |  |  |  |  |  |  | 36 |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of opt-out Individuals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115 | 31 | 5 |  |  |  |  |  |  |
Number of individuals represented new counsel | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of suits prosecuted |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of complaints related and transferred to judge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Number of plaintiffs who have not settled |  |  |  |  |  |  |  |  | 95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs dismissed | 80 |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs not represented |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pro per plaintiffs | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than pro per plaintiffs | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two of 13 pro plaintiffs | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pro per plaintiffs in action | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Court expected to set a trial date Minimum | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Court expected to set a trial date Minimum | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of students in class |  |  |  |  |  |  |  |  |  |  | 2,300 |  |  | 2,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs that can proceed with individual cases |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of alleged claims for equitable relief |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of claims added for money damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Opt-out period expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2011-06-20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individuals WCI file motion to compel arbitration |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,062 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mass action filed |  |  |  |  | 8 |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Two later versions of arbitration agreement issue |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individuals that signed arbitration agreement |  |  |  |  |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individuals have filed arbitration demands |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individual plaintiffs sent offers to compromise |  |  |  |  |  |  |  | 1,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offers to compromise accepted to date |  |  |  |  |  |  |  | 345 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of payments made |  |  |  |  |  |  |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of recently added new plaintiff |  |  |  |  |  |  |  | 385 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active plaintiffs in consolidated action |  |  |  |  |  |  |  | 1,052 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims for negligent and willful violation of TCPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Injunctive relief statutory and treble damages seeks by plaintiff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500
Number of former employees who filed complaint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Additional number of students joining litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs agreed to dismiss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Number of defendant that has accepted offer to compromise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Number of remaining plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |
Number of OIG Findings |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of documentation of attendance of students enrolled in CTU's |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of calculation of returns of Title IV Program funds |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential liability related to audit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000 | $ 2,500,000 |  |

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