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Acquisitions - Summary of Fair Value of Aggregate Consideration Paid (Parenthetical) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Jan. 03, 2019
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]      
Net cash paid   $ 237,684 $ 9,250
SiriusDecisions, Inc [Member]      
Business Acquisition [Line Items]      
Cash acquired $ 7,900    
Net cash paid 237,700    
Working capital adjustment $ (1,259)