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Goodwill and Intangible Assets - Schedule of Change in Carrying Amount of Goodwill (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Goodwill And Intangible Assets [Line Items]  
Goodwill, beginning balance $ 74,565
Goodwill, ending balance 75,110
Logentries [Member]  
Goodwill And Intangible Assets [Line Items]  
Acquisition $ 545