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Commitments and Contingencies - Additional Information (Detail) (USD $) | 6 Months Ended |  |  | 6 Months Ended |  |  |  |  | 3 Months Ended | 1 Months Ended |  | 6 Months Ended |  |  | 1 Months Ended |  |  |  | 6 Months Ended |  |  |  |  |  |
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Jun. 30, 2013 Plaintiff Person | Dec. 31, 2012 | Jan. 13, 2012 Findings | Jun. 30, 2013 Derivatives [Member] | Jun. 30, 2013 Ross [Member] | May 03, 2012 Ross [Member] Defendant | Jun. 30, 2013 Vasquez [Member] Claim | Aug. 10, 2012 Vasquez [Member] Person Arbitration | Jun. 15, 2012 Vasquez [Member] Claim | Sep. 30, 2012 Code of Civil Procedure [Member] Plaintiff | Apr. 25, 2010 Sumrall [Member] D | Jun. 30, 2013 NYAGMember | Jun. 30, 2013 Amador [Member] Plaintiff Lawsuits | Sep. 27, 2007 Amador [Member] Plaintiff | Jan. 18, 2013 Coleman case [Member] Person | Apr. 22, 2011 Surrett [Member] Student | May 23, 2012 Surrett [Member] Members | Apr. 10, 2008 Surrett [Member] Claim | Mar. 05, 2008 Surrett [Member] Claim | Jun. 30, 2013 Stafford [Member] Claim | Feb. 28, 2013 Stafford [Member] | Jul. 14, 2008 False Claims Act Lawsuit [Member] Employees | Jun. 30, 2013 OIG Audit [Member] | Jun. 03, 2011 Abarca [Member] Person | Jun. 15, 2011 Andrade [Member] Person | Aug. 12, 2011 Aprieto [Member] Person
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for legal fees and settlements | $ 49,400,000 | $ 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recovery pending settlement of legal matters | 32,500,000 |  |  | 20,000,000 | 22,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of executive officers as defendants |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency range of possible loss maximum |  |  |  |  | 27,500,000 |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Insurance recovery to be transferred |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining settlement amount to be paid |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recovery in dispute |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recovery to be allocated to other liabilities |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of student plaintiffs | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |  |  |  |  |  |  |  |
Number of opt-out Individuals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115 | 31 | 5
Number of individuals represented new counsel | 78 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Number of suits prosecuted |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs who have not settled |  |  |  |  |  |  |  |  |  |  |  |  | 80 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of test cases to be tried to the Court | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of test cases to be tried to the Court | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of alleged claims for equitable relief |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of claims added for money damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Number of students in class |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individuals that signed arbitration agreement |  |  |  |  |  |  |  | 54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individuals have filed arbitration demands |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of arbitrations which have been tried to final award |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of arbitrations which have settled |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of arbitrations set for hearing |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Number Of Hours Per Week |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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