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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Plaintiff
Inquiry
Dec. 31, 2012
Jan. 13, 2012
Findings
Jun. 12, 2013
Derivatives [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Minimum [Member]
Jun. 30, 2013
Ross [Member]
May 03, 2012
Ross [Member]
Defendant
Jun. 15, 2012
Vasquez [Member]
Plaintiff
Dec. 31, 2013
Vasquez [Member]
Plaintiff
Aug. 10, 2012
Vasquez [Member]
Arbitration
Person
Dec. 31, 2013
Code of Civil Procedure [Member]
Plaintiff
Dec. 31, 2013
Surrett [Member]
Student
May 23, 2012
Surrett [Member]
Members
Apr. 10, 2008
Surrett [Member]
Claim
Mar. 05, 2008
Surrett [Member]
Claim
Jul. 14, 2008
False Claims Act Lawsuit [Member]
Employees
Jun. 03, 2011
Abarca [Member]
Person
Jun. 15, 2011
Andrade [Member]
Person
Aug. 12, 2011
Aprieto [Member]
Person
Jan. 18, 2013
Coleman case [Member]
Person
Dec. 31, 2013
Amador [Member]
Lawsuits
Plaintiff
Dec. 31, 2013
Amador and California Education Code [Member]
Complaints
Dec. 31, 2013
OIG Audit [Member]
Loss Contingencies [Line Items]                                                
Accrual for legal fees and settlements $ 20.3 $ 5.8                                            
Number of executive officers as defendants               2                                
Loss contingency range of possible loss maximum             27.5                                 0.8
Insurance recovery pending settlement of legal matters       20.0     22.5                                  
Insurance recovery to be transferred       10.0     10.0                                  
Remaining settlement amount to be paid             5.0                                  
Insurance recovery to be allocated to other liabilities       10.0                                        
Attorney fees and expenses       5.0                                        
Number of opt-out Individuals                                   115 31 5 2      
Number of suits prosecuted                                           4    
Number of complaints related and transferred to judge                                             4  
Number of plaintiffs who have not settled                                           80    
Number of test cases to be tried to the court 8                                              
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 student plaintiffs 1,000                                              
Number of plaintiffs                 1,438                              
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                     8                          
Number of active plaintiffs in consolidated action                       1,047                        
Settlement amount to be paid         17.5 15.5                                    
Amount recorded as reserve for settlement $ 15.5                                              
Number of former employees who filed complaint                                 4              
Number of inquiries attorney general will act as point of contact 13                                              
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