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Contingencies - Additional Information (Detail)
$ in Thousands
 3 Months Ended 5 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Jul. 31, 2018
Claim
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingencies [Line Items]          
Number of arbitration claims filed | Claim   319      
Write-off of accounts receivable     $ 29,740 $ 28,179 $ 29,136
Student receivables, net of allowance for doubtful accounts $ 942   $ 942 2,548  
AG Agreement [Member]          
Loss Contingencies [Line Items]          
Aggregate pre-tax charge 6,400        
Payment to the collective group of attorneys general to cover expenses incurred during the course of their inquiry $ 5,000        
Inquiry period 5 years        
Accounts receivable, description     The write-off of approximately $1.4 million of accounts receivable. Although the Company agreed to forgo efforts to collect on approximately $556 million of old accounts receivable that were incurred during the last 30 years by students at over 100 campuses who reside in participating states, all but approximately $1.4 million of these old accounts receivable were written-off in prior reporting periods over the last 30 years in the ordinary course of the Company’s operations. The agreement to forgo efforts to collect on these previously written-off receivables does not require any additional write-off expense to the Company’s financial statements.    
Write-off of accounts receivable $ 1,400        
Student receivables, net of allowance for doubtful accounts 556,000   $ 556,000    
Committed to reimburse the administrator’s fees and expenses to be paid over the next three years. 2,000        
Duration of agreement period, operational aspects     6 years    
Other Current Liabilities [Member]          
Loss Contingencies [Line Items]          
Accrual for legal fees and settlements $ 6,100   $ 6,100 $ 8,700