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Acquisitions/ Divestitures - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 05, 2019
Sep. 13, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Pre-tax gain on sale of business       $ (40,700) $ 0 $ 0
SinglePlatform | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Business Acquisition [Line Items]            
Cash consideration received $ 51,000          
Pre-tax gain on sale of business     $ (40,700)      
Revenues       $ 25,400 $ 28,400  
Ecomdash            
Business Acquisition [Line Items]            
Aggregate purchase price   $ 9,600        
Cash payment for acquisition at closing   $ 8,900