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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
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