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Description of the Business and Summary of Significant Accounting Policies - Property and Equipment, Net (Details)
3 Months Ended
Mar. 31, 2019
Minimum  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 3 years
Minimum | Buildings  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 20 years
Minimum | Datacenter and other computer equipment  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 3 years
Minimum | Office equipment and other  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 3 years
Maximum  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 7 years
Maximum | Buildings  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 30 years
Maximum | Datacenter and other computer equipment  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 5 years
Maximum | Office equipment and other  
Property, Plant and Equipment [Line Items]  
Property and equipment, useful life 7 years