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Acquisitions - Additional Information (Detail)
 3 Months Ended
Jan. 03, 2019
USD ($)
Employee
Jul. 06, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Additional purchase price paid     $ 766,000    
Acquisitions, net of cash acquired     238,943,000    
Increase (decrease) in goodwill     157,400,000    
Decrease in goodwill due to foreign currency fluctuations     400,000    
SiriusDecisions, Inc [Member]          
Business Acquisition [Line Items]          
Revenue     15,200,000    
Direct expenses including intangible amortization     24,900,000    
FeedbackNow [Member]          
Business Acquisition [Line Items]          
Acquisition date   Jul. 06, 2018      
Percentage of issued and outstanding shares acquired   100.00%      
Purchase price paid   $ 8,400,000      
Acquisition price due and subject to indemnity provisions from seller   1,500,000      
Additional purchase price paid     800,000    
Maximum consideration payable based on the financial performance of acquired company   4,200,000      
Business acquisition undiscounted amounts could be payable, minimum   0      
Contingent purchase price   $ 3,400,000      
FeedbackNow [Member] | Scenario, Forecast [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Additional consideration payable to sellers based on financial performance       $ 2,500,000 $ 1,700,000
SiriusDecisions, Inc [Member]          
Business Acquisition [Line Items]          
Percentage of issued and outstanding shares acquired 100.00%        
Purchase price paid $ 245,000,000        
Number of employees | Employee 350        
Consideration paid at closing $ 247,300,000        
Cash acquired 7,900,000        
Adjustment for transaction-related expenses 500,000        
Acquisitions, net of cash acquired $ 238,900,000        
Increase in goodwill due to acquisition     157,800,000    
Acquisition costs recognized     $ 1,700,000