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Goodwill and Intangible Assets - Schedule of Change in Carrying Amount of Goodwill (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill, beginning balance $ 74,565
Goodwill, ending balance 74,943
Logentries [Member]  
Goodwill And Intangible Assets [Line Items]  
Acquisition $ 378