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Leases - Additional Information (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]    
Operating lease, right of use asset $ 86,994 $ 0
Operating lease, liability 114,603  
UNITED STATES    
Operating Leased Assets [Line Items]    
Operating lease, right of use asset 72,200  
Operating lease, liability 98,900  
UNITED STATES | Northern Virginia Office Space    
Operating Leased Assets [Line Items]    
Operating lease, right of use asset 67,800  
Operating lease, liability $ 94,400  
Area of office space | ft² 214,000  
Lease term expiration date Dec. 31, 2030  
Lease option to extend, description option for the Company to extend the term for an additional five or 10 consecutive years  
UNITED STATES | Minimum | Northern Virginia Office Space    
Operating Leased Assets [Line Items]    
Lease extension term 5 years  
UNITED STATES | Maximum | Northern Virginia Office Space    
Operating Leased Assets [Line Items]    
Lease extension term 10 years  
Non-US    
Operating Leased Assets [Line Items]    
Operating lease, right of use asset $ 14,800  
Operating lease, liability $ 15,700