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Acquisitions - Additional Information (Detail) - USD ($)
3 Months Ended
Nov. 05, 2018
Oct. 31, 2018
Mar. 31, 2019
Datawatch Corporation [Member]      
Business Acquisition [Line Items]      
Business acquisition purchase price $ 13.10   $ 13.10
Business acquisition, consideration     $ 183,400,000
Business combination, consideration transferred value     168,200,000
Business combination, consideration transferred, liabilities incurred     500,000
Business combination, consideration transferred for outstanding equity awards     6,700,000
Payments of outstanding debt     8,000,000
Fair value of consideration transferred $ 183,427,000    
Fair value of assets acquired and liabilities assumed $ 52,194,000    
SIMSOLID Corporation [Member]      
Business Acquisition [Line Items]      
Fair value of consideration transferred   $ 22,100,000  
Fair value of assets acquired and liabilities assumed     $ 0