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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2021
USD ($)
Customer
ConsumerandBusinessLeader
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Dec. 31, 2020
USD ($)
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Dec. 31, 2019
USD ($)
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Jan. 01, 2019
USD ($)
Summary Of Significant Accounting Policy [Line Items]        
Number of real time feedback votes included in annual surveys | Customer 70      
(Decrease) increase in retained earnings $ 152,825,000 $ 127,981,000    
Operating lease right-of-use assets 65,009,000 $ 69,296,000    
Operating lease liabilities 78,030,000      
Lease package practical expedients   true    
Deferred revenue 213,696,000 $ 179,968,000    
Prepaid expenses and other current assets 18,614,000 18,588,000    
Deferred commissions 29,631,000 23,620,000    
Other assets $ 9,660,000 5,524,000    
Original maturities 90 days      
Number of customers accounted for revenues or accounts receivable greater than 3% or 3% of total | Customer 0      
Annual goodwill impairment test, period November 30th      
Goodwill impairment charges $ 0 0 $ 0  
Long-lived asset impairment charges 0 3,400,000 0  
Foreign exchange losses 1,500,000 (600,000) (900,000)  
Revenue from Contract with Customer, Excluding Assessed Tax 494,315,000 448,984,000 461,697,000  
Contract assets $ 0      
Contract with customer, contract duration 1 year      
Deferred revenue recognized $ 154,900,000 153,200,000    
Revenue expected to be recognized 800,000      
Amortization expense related to deferred commissions 900,000 0.0 36,000,000.0  
Impairment of deferred commissions $ 0 0 0  
Option to extend description Some of the Company’s leases include options to extend or terminate the lease. When determining the lease term, these options are included in the measurement and recognition of the Company’s ROU assets and lease liabilities when it is reasonably certain that the Company will exercise the option(s).      
Advertising expense $ 2,100,000 $ 700,000 $ 300,000  
Stock options granted | shares 0 0 0  
Unamortized fair value stock based compensation $ 22,900      
Weighted average remaining recognition period 2 years 7 months 6 days      
Research Service Revenue [Member] | Customer Concentration Risk [Member] | Major Customer [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Customer accounted for percentage 3.00%      
Revision of Prior Period Accounting Standards Update Adjustment [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 0      
Revision of Prior Period Accounting Standards Update Adjustment [Member] | Research Services [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax   $ 7,100,000    
ASU No. 2016-13 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
ASU No. 2017-04 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, immaterial effect true      
ASU No. 2018-13 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, immaterial effect true      
ASU No. 2018-15 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2020      
Change in accounting principle, accounting standards update, immaterial effect   true    
Topic 842 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, adoption date Jan. 01, 2019      
Change in accounting principle, accounting standards update, immaterial effect true      
Operating lease right-of-use assets       $ 53,300,000
Operating lease liabilities       60,800,000
Topic 842 [Member] | Effect of Adoption [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Deferred rent       $ 7,500,000
ASU No. 2016-15 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, immaterial effect   true    
ASU No. 2016-18 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Change in accounting principle, accounting standards update, immaterial effect true      
Consulting Services Revenue [Member] | Revision of Prior Period Accounting Standards Update Adjustment [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax     $ 5,100,000  
ASU No. 2018-02 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
ASU No. 2014-09 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Change in accounting principle, accounting standards update, adopted true      
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU No. 2016-13 [Member]        
Summary Of Significant Accounting Policy [Line Items]        
(Decrease) increase in retained earnings $ (200,000)      
Minimum [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Number of consumers and business leaders and technology leaders included in annual surveys | ConsumerandBusinessLeader 700,000      
Consulting services period 14 days 14 days    
Advisory services period   1 hour    
Maximum [Member]        
Summary Of Significant Accounting Policy [Line Items]        
Consulting services period 3 months      
Advisory services period 2 days      
Contract with customer, expected payment term one year