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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 1 Months Ended 6 Months Ended 3 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended
Sep. 30, 2013
Person
Plaintiff
Sep. 30, 2013
Plaintiff
Person
Jun. 30, 2013
Dec. 31, 2012
Jan. 13, 2012
Findings
Sep. 30, 2013
NYAG [Member]
Jun. 12, 2013
Derivatives [Member]
Jun. 30, 2013
Ross [Member]
May 03, 2012
Ross [Member]
Defendant
Sep. 30, 2013
Vasquez [Member]
Claim
Aug. 10, 2012
Vasquez [Member]
Arbitration
Person
Jun. 15, 2012
Vasquez [Member]
Claim
Sep. 30, 2012
Code of Civil Procedure [Member]
Plaintiff
Apr. 25, 2010
Sumrall [Member]
Sep. 30, 2013
Amador [Member]
Plaintiff
Lawsuits
Sep. 27, 2007
Amador [Member]
Plaintiff
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
Apr. 22, 2011
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
Sep. 30, 2013
OIG Audit [Member]
Sep. 30, 2013
Additional Costs [Member]
NYAG [Member]
Sep. 30, 2013
Administrative Fees [Member]
NYAG [Member]
Product Liability Contingency [Line Items]                                                        
Accrual for legal fees and settlements $ 38.5 $ 38.5   $ 5.8                                                
Insurance recovery pending settlement of legal matters   32.5         20.0 22.5                                        
Number of executive officers as defendants                 2                                      
Loss contingency range of possible loss maximum               27.5                                   0.8    
Insurance recovery to be transferred             10.0 10.0                                        
Remaining settlement amount to be paid               5.0                                        
Insurance recovery in dispute               5.0                                        
Insurance recovery to be allocated to other liabilities             10.0                                          
Attorney fees and expenses             5                                          
Number of student plaintiffs 1,000 1,000                           36                        
Number of opt-out Individuals                                 115 31 5                  
Number of individuals represented new counsel 78 78                                   2                
Number of suits prosecuted                             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 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 individual plaintiffs sent offers to compromise                         1,438                              
Number of offers to compromise accepted to date                         346                              
Aggregate amount of payments made                         2.1                              
Number of active plaintiffs in consolidated action                         1,047                              
Number of former employees who filed complaint                                                 4      
Number Of Hours Per Week                           40 hours                            
Loss contingency, amount paid into fund           9.3                                         1.0 0.2
Loss contingency, estimable loss     10.0                                                  
Loss contingency, amount paid $ 10.3                                                      
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