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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended
Jul. 25, 2016
GBP (£)
Jul. 14, 2016
GBP (£)
Jun. 29, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]                
Average borrowings outstanding       $ 473,700,000 $ 404,100,000 $ 429,400,000 $ 435,800,000  
Weighted average interest rate of borrowings       6.20% 7.20% 6.90% 7.00%  
Net interest expense incurred       $ 7,900,000 $ 7,300,000 $ 22,500,000 $ 23,300,000  
7.25% Unsecured Notes due February 1, 2019 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage       7.25%   7.25%   7.25%
Fair value of debt instrument       $ 436,300,000   $ 436,300,000   $ 436,600,000
Carrying value of debt instrument [1]       $ 398,938,000   $ 398,938,000   398,596,000
Other Indebtedness [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Maturity year, start           Dec. 31, 2019    
Debt Instrument, Maturity year, end           Dec. 31, 2025    
Other Indebtedness [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage       2.00%   2.00%    
Other Indebtedness [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Interest Rate, Stated Percentage       6.00%   6.00%    
Five-Year Revolving Credit Agreement dated June 29, 2015 [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity     $ 200,000,000          
Debt Instrument, Term     5 years          
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]                
Debt Instrument [Line Items]                
Borrowings outstanding [2]       $ 96,984,000   $ 96,984,000   $ 0
Education [Member] | Interest Rate Swap [Member]                
Debt Instrument [Line Items]                
Derivative, Fixed Interest Rate 0.51%              
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.01%              
Debt Instrument, Basis Spread on Variable Rate 1.50%              
Derivative, Notional Amount | £ £ 75,000,000              
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity | £   £ 75,000,000            
Debt Instrument, Term   4 years            
Borrowings outstanding | £ £ 75,000,000              
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | Debt Instrument, Redemption, first anniversary [Member]                
Debt Instrument [Line Items]                
Debt Instrument Price Percentage Of Outstanding Balance Redeemed   6.66%            
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | Debt Instrument, Redemption, second anniversary [Member]                
Debt Instrument [Line Items]                
Debt Instrument Price Percentage Of Outstanding Balance Redeemed   6.66%            
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | Debt Instrument, Redemption, third anniversary [Member]                
Debt Instrument [Line Items]                
Debt Instrument Price Percentage Of Outstanding Balance Redeemed   6.66%            
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.25%            
Education [Member] | Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Basis Spread on Variable Rate   1.75%            
[1] The carrying value is net of $0.1 million of unamortized debt issuance costs as of September 30, 2016 and December 31, 2015, respectively.
[2] The carrying value is net of $0.6 million of unamortized debt issuance costs as of September 30, 2016