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Contingencies (Details)
£ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 11, 2015
claim
Aug. 17, 2011
Complaint
claim
Aug. 31, 2017
USD ($)
conditions
Dec. 31, 2018
USD ($)
claim
program_review
Dec. 31, 2018
USD ($)
claim
program_review
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
GBP (£)
claim
program_review
Loss Contingencies [Line Items]                
Number of existing legal claims or proceedings that are likely to have a material effect on the Company's business | claim       0 0     0
Loss on Guarantor Lease Obligations         $ 17,518,000 $ 0 $ 0  
Deferred Charges and Other Assets       $ 117,830,000 117,830,000 $ 102,046,000    
Celtic Healthcare Allegheny Health Network Joint Venture [Member]                
Loss Contingencies [Line Items]                
Number of conditions out of compliance | conditions     4          
Number of days of noncompliance     31 days          
Maximum [Member]                
Loss Contingencies [Line Items]                
Loss contingency, estimate of possible loss       45,000,000 45,000,000      
Maximum [Member] | Celtic Healthcare Allegheny Health Network Joint Venture [Member]                
Loss Contingencies [Line Items]                
Amount of penalties per day or per instance of noncompliance     $ 10,000          
Education [Member] | Diaz Case [Member]                
Loss Contingencies [Line Items]                
The number of separate complaints included in the Diaz case that received rulings | Complaint   3            
Remaining employment claim in the Diaz complaint | claim   1            
Education [Member] | Diaz Claims [Member]                
Loss Contingencies [Line Items]                
Number of claims affirmed for dismissal by US Court of Appeals | claim 3              
Number of claims appealed | claim 4              
Sale Of KHE Campuses Business [Member]                
Loss Contingencies [Line Items]                
Loss on Guarantor Lease Obligations       $ 17,500,000 $ 17,500,000      
Higher Education [Member] | Sale Of KHE Campuses Business [Member] | Education [Member]                
Loss Contingencies [Line Items]                
Number of pending ED program reviews | program_review       2 2     2
Kaplan International [Member] | UK Pathways [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]                
Loss Contingencies [Line Items]                
Loss contingency, estimate of possible loss | £               £ 15.4
Deferred Charges and Other Assets | £               £ 15.4