v3.8.0.1
Goodwill and Amortizable Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 01, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Amortizable Intangible Assets        
Goodwill   $ 71,988    
Change in goodwill balance as a result of changes in foreign currency   3,800    
Gross Carrying Amount   124,542 $ 57,817  
Accumulated Amortization   (33,781) (23,686)  
Net Carrying Amount   90,761 34,131  
Amortization expense   $ 14,000 8,000 $ 6,100
Capitalized technology        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years)   3 years    
Gross Carrying Amount   $ 27,108 17,100  
Accumulated Amortization   (9,486) (7,822)  
Net Carrying Amount   $ 17,622 9,278  
Capitalized content development        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years)   4 years    
Gross Carrying Amount   $ 55,872 37,956  
Accumulated Amortization   (21,417) (15,367)  
Net Carrying Amount   $ 34,455 22,589  
University client relationships        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years)   9 years    
Gross Carrying Amount   $ 29,443    
Accumulated Amortization   (1,636)    
Net Carrying Amount   $ 27,807    
Trade names and domain names        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years)   10 years    
Gross Carrying Amount   $ 12,119 2,761  
Accumulated Amortization   (1,242) (497)  
Net Carrying Amount   10,877 2,264  
In process capitalized technology and content development        
Goodwill and Amortizable Intangible Assets        
Net Carrying Amount   $ 15,600 $ 8,700  
GetSmarter        
Goodwill and Amortizable Intangible Assets        
Goodwill $ 68,172      
GetSmarter | Capitalized technology        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years) 3 years      
GetSmarter | Capitalized content development        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years) 4 years      
GetSmarter | University client relationships        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years) 9 years      
GetSmarter | Trade names and domain names        
Goodwill and Amortizable Intangible Assets        
Estimated Average Useful Life (in years) 10 years      
GetSmarter | Short Course Segment        
Goodwill and Amortizable Intangible Assets        
Goodwill $ 68,200