v3.10.0.1
Goodwill and Amortizable Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]            
Payments made for acquisition of software       $ 9,500    
Purchase of website and domains       5,700    
Amortization expense $ 5,500   $ 2,700 10,700 $ 5,100  
Future amortization expense            
Net Carrying Amount 126,062     126,062   $ 90,761
Excluding in process capitalized technology and content development            
Future amortization expense            
Remainder of 2018 12,531     12,531    
2019 20,973     20,973    
2020 17,978     17,978    
2021 13,665     13,665    
2022 9,924     9,924    
Thereafter 20,362     20,362    
Net Carrying Amount 95,433     95,433    
WeWork Companies, Inc.            
Finite-Lived Intangible Assets [Line Items]            
Agreement to offer scholarships       5,000    
Flatiron School, Inc | Software development license and services agreement            
Finite-Lived Intangible Assets [Line Items]            
License and service cost   $ 14,500        
Payments made for acquisition of software       13,200    
Accrued liability current 4,200     4,200    
Outstanding license and software services Consideration $ 1,300     $ 1,300