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Business Acquisitions - Narrative (Details)
 12 Months Ended
Jun. 04, 2021
USD ($)
Oct. 28, 2020
USD ($)
Dec. 31, 2021
USD ($)
subsidiary
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 21, 2019
USD ($)
Apr. 19, 2019
USD ($)
Apr. 02, 2019
USD ($)
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting     $ (932,000) $ 7,591,000        
Goodwill     97,032,000 202,901,000        
Fiscal 2021 Acquisitions                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions     39,900,000          
Total consideration of transactions     160,400,000          
Fair value of accounts receivable acquired     9,500,000          
Gross amount due under contracts     9,900,000          
Amount expected to be uncollectible     400,000          
Expected income tax deductible amount     42,100,000          
Fiscal 2021 Acquisitions | Digital Media                
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting     (1,400,000)          
Fiscal 2021 Acquisitions | Cybersecurity and Martech                
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting     500,000          
SEOmoz Acquisition                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions     25,600,000          
Total consideration of transactions $ 67,000,000              
Gross amount due under contracts 3,600,000              
Amount expected to be uncollectible $ 300,000              
Expected income tax deductible amount     $ 0          
Fiscal 2020 Acquisitions                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions       54,600,000        
Total consideration of transactions       472,800,000        
Fair value of accounts receivable acquired       46,100,000        
Gross amount due under contracts       53,000,000        
Amount expected to be uncollectible       6,900,000        
Goodwill       202,900,000        
Expected income tax deductible amount       55,000,000        
Pro forma net income for existing line of business       100,000 $ 28,200,000      
Pro forma net income for assets sold       8,400,000 13,900,000      
Fiscal 2020 Acquisitions | Digital Media                
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting       9,700,000        
Fiscal 2020 Acquisitions | Cybersecurity and Martech                
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting       2,100,000        
RetailMeNot, Inc.                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions       47,600,000        
Total consideration of transactions   $ 414,400,000            
Fair value of accounts receivable acquired   40,500,000            
Gross amount due under contracts   47,200,000            
Amount expected to be uncollectible   $ 6,700,000            
Goodwill       169,600,000        
Expected income tax deductible amount       36,600,000        
Pro forma net income for existing line of business       100,000 28,200,000      
Pro forma net income for assets sold       $ 8,400,000 13,900,000      
Fiscal 2019 Acquisitions                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions         126,300,000      
Total consideration of transactions         429,500,000      
Fair value of accounts receivable acquired         22,800,000      
Gross amount due under contracts         23,700,000      
Amount expected to be uncollectible         900,000      
Goodwill         253,100,000      
Expected income tax deductible amount         95,100,000      
Fiscal 2019 Acquisitions | Digital Media                
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting         (900,000)      
Fiscal 2019 Acquisitions | Fax and Martech Segment                
Business Acquisition [Line Items]                
Increase (decrease) in goodwill from adjustment under purchase accounting         200,000      
Highwinds Capital, Inc. and Cloak Holdings, LLC                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions         53,000,000      
Gross amount due under contracts               $ 1,000,000
Amount expected to be uncollectible               $ 100,000
Expected income tax deductible amount         15,200,000      
BabyCenter LLC.                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions         19,200,000      
Gross amount due under contracts             $ 10,500,000  
Amount expected to be uncollectible             $ 200,000  
Expected income tax deductible amount         34,600,000      
Spiceworks, Inc.                
Business Acquisition [Line Items]                
Revenues contributed through acquisitions         23,000,000      
Gross amount due under contracts           $ 10,800,000    
Amount expected to be uncollectible           $ 400,000    
Expected income tax deductible amount         $ 0      
Series of Individually Immaterial Business Acquisitions                
Business Acquisition [Line Items]                
Number of immaterial acquisitions | subsidiary     4