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Contingencies - Additional Information (Detail)
 1 Months Ended 9 Months Ended
May 31, 2017
Sep. 30, 2017
USD ($)
Student
Dec. 31, 2016
USD ($)
Jan. 13, 2012
Finding
Mar. 05, 2008
Claim
Loss Contingencies [Line Items]          
Accrual for legal fees and settlements | $   $ 2,200,000 $ 34,500,000    
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  
Surrett [Member]          
Loss Contingencies [Line Items]          
Number of alleged claims for equitable relief | Claim         2
Surrett [Member] | Maximum [Member]          
Loss Contingencies [Line Items]          
Number of individuals in certified class | Student   1,275      
OIG Audit [Member]          
Loss Contingencies [Line Items]          
Expected audit resolve period 30 days        
OIG Audit [Member] | Maximum [Member]          
Loss Contingencies [Line Items]          
Potential liability related to audit | $   $ 1,000,000