v3.10.0.1
Goodwill and Amortizable Intangible Assets - Estimated Future Amortization Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 $ 6,400   $ 3,600 17,100 $ 8,700  
Future amortization expense            
Net Carrying Amount 130,692     130,692   $ 90,761
Excluding in process capitalized technology and content development            
Future amortization expense            
Remainder of 2018 6,094     6,094    
2019 23,015     23,015    
2020 19,996     19,996    
2021 15,503     15,503    
2022 11,688     11,688    
Thereafter 22,043     22,043    
Net Carrying Amount 98,339     98,339    
WeWork Companies, Inc.            
Finite-Lived Intangible Assets [Line Items]            
Agreement to offer scholarships       5,000    
Purchase obligation 3,000     3,000    
Flatiron School, Inc | Software development license and services agreement            
Finite-Lived Intangible Assets [Line Items]            
Payments made for acquisition of software       13,200    
License and service cost   $ 14,500        
Accrued liability current 4,200     4,200    
Outstanding license and software services consideration $ 1,300     $ 1,300