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Acquisitions - Summary of Amounts of Identified Assets Acquired and Liabilities Assumed at the Acquisition Date (Detail) - USD ($)
$ in Thousands
Nov. 05, 2018
Jun. 30, 2019
Dec. 31, 2018
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Goodwill   $ 212,087 $ 210,532
Datawatch Corporation [Member]      
Business Acquisition [Line Items]      
Fair value of consideration transferred $ 183,427    
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Cash 8,278    
Accounts receivable 10,384    
Other assets 2,522    
Property and equipment 980    
Accounts payable and other liabilities (5,041)    
Deferred revenue (3,649)    
Other long-term liabilities (8,340)    
Total net identifiable assets acquired and liabilities assumed 51,834    
Goodwill 131,593    
Datawatch Corporation [Member] | Trade Names [Member]      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Indefinite-lived intangibles 7,400    
Datawatch Corporation [Member] | Developed Technology [Member]      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Finite-lived intangibles 22,600    
Datawatch Corporation [Member] | Customer Relationships [Member]      
Recognized amounts of identifiable assets acquired and liabilities assumed:      
Finite-lived intangibles $ 16,700