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Other Long-Term Liabilities - Deferred (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jun. 30, 2007
USD ($)
Asset
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Sale price of one of campus buildings     $ 5.8    
Gain on sale and lease back of one of campus buildings before tax     $ 2.8    
Sale and lease back term       10 years  
Number of assets sold | Asset     1    
Minimum [Member]          
Leasehold improvements and long-term liability amortization period       5 years  
Maximum [Member]          
Leasehold improvements and long-term liability amortization period       10 years  
New York Code And Design Academy, Inc.          
Deferred payment arrangements value       $ 7.5  
Contingent consideration payment $ 0.5 $ 6.0   4.6  
New York Code And Design Academy, Inc. | Maximum [Member]          
Deferred payment arrangements value       11.5  
Jack Welch Management Institute          
Funds received from investor       $ 2.8  
Deferred payment arrangement number of sellers | item       1  
Deferred payment arrangements value       $ 3.4 $ 3.3