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Investments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 11, 2013
May 06, 2013
Jan. 31, 2011
Mar. 31, 2017
Web International Education Group, Ltd.(Web)        
Investments        
Investment     $ 10.0  
Ownership percentage     20.00%  
Interest on investment (as a percent)     8.00%  
Web International Education Group, Ltd.(Web) | Other current assets        
Investments        
Investment reclassified   $ 10.0    
Outstanding balance of investment       $ 10.0
Web International Education Group, Ltd.(Web) | Minimum        
Investments        
Option to purchase investment interest in investee (as a percent)     51.00%  
School Mortgage        
Investments        
Interest on investment (as a percent) 5.25%      
Issuance of a mortgage note $ 2.1      
Note receivable term 5 years      
Fair value of assets held for sale       1.2
Impairment loss       $ 0.6