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Property and Equipment by Geographic Area (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net $ 55,806 $ 57,096
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net 44,469 45,498
EMEA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net 5,162 5,114
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net 3,497 3,704
Other international    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net $ 2,678 $ 2,780