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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Mar. 31, 2014
Inquiry
Plaintiff
Dec. 31, 2013
Jan. 13, 2012
Findings
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Derivatives [Member]
Mar. 31, 2014
Ross [Member]
Jun. 15, 2012
Vasquez [Member]
Plaintiff
Claim
Mar. 31, 2014
Vasquez [Member]
Plaintiff
Aug. 10, 2012
Vasquez [Member]
Person
Arbitration
Mar. 31, 2014
California Code of Civil Procedure [Member]
Plaintiff
Apr. 22, 2011
Surrett [Member]
Student
Mar. 31, 2014
Surrett [Member]
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
Mar. 11, 2014
Insurance Claims [Member]
Mar. 31, 2014
Amador [Member]
Lawsuits
Plaintiff
Mar. 31, 2014
CCA Complaints [Member]
Plaintiff
Mar. 31, 2014
OIG Audit [Member]
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
Mar. 31, 2014
Amador and California Education Code [Member]
Complaints
Loss Contingencies [Line Items]                                                    
Accrual for legal fees and settlements $ 28.9 $ 20.3                                                
Coverage amount claimed by insurance company 3.0     17.5 15.5   10.0                     10.0                
Loss contingency range of possible loss maximum           27.5                             0.8          
Insurance recovery pending settlement of legal matters           22.5                                        
Insurance recovery to be transferred           10.0                                        
Insurance recovery to be allocated to other liabilities           5.0                                        
Additional settlement amount to be paid           3.8                                        
Additional settlement agreement date           April 15, 2014                                        
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                 97                   79 77            
Attorneys' fees and expenses 2.2                                                  
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   950                              
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 14                                                  
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