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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jan. 03, 2019
USD ($)
Jan. 02, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
ConsumerandBusinessLeader
Customer
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Summary Of Significant Accounting Policy [Line Items]                          
Reclassification adjustment to retained earnings for tax effects                     $ 3,803,000 $ (419,000)  
Deferred revenue     $ 135,332,000       $ 145,207,000       135,332,000 145,207,000  
Prepaid expenses and other current assets     12,802,000       18,942,000       12,802,000 18,942,000  
Deferred commissions     15,677,000       13,731,000       15,677,000 13,731,000  
Other assets     5,310,000       6,231,000       5,310,000 6,231,000  
Retained earnings     127,717,000       123,010,000       127,717,000 123,010,000  
Total assets     353,524,000       345,200,000       353,524,000 345,200,000  
Total revenues     98,583,000 $ 84,890,000 $ 96,353,000 $ 77,749,000 90,377,000 $ 80,369,000 $ 89,733,000 $ 77,194,000 357,575,000 337,673,000 $ 326,095,000
Net income     $ 5,375,000 $ 3,950,000 $ 7,788,000 $ (1,733,000) $ 2,093,000 $ 3,953,000 $ 6,064,000 $ 3,030,000 $ 15,380,000 $ 15,140,000 $ 17,651,000
Diluted income per common share | $ / shares     $ 0.29 $ 0.21 $ 0.43 $ (0.10) $ 0.11 $ 0.22 $ 0.34 $ 0.16 $ 0.84 $ 0.83 $ 0.97
Original maturities                     90 days    
Number of customers accounted for revenues or accounts receivable greater than 3% or 6% of total | Customer                     0    
Annual goodwill impairment test, period                     November 30th    
Goodwill impairment charges                     $ 0 $ 0 $ 0
Non-current deferred rent liabilities     $ 6,602,000       $ 7,523,000       6,602,000 7,523,000  
Foreign exchange gains (losses)                     (603,000) $ (632,000) $ 81,000
Contract assets     0               $ 0    
Contract with customer, contract duration                     1 year    
Deferred revenue recognized                     $ 134,700,000    
Revenue expected to be recognized     262,600,000               262,600,000    
Amortization expense related to deferred commissions                     $ 32,200,000    
Options granted | shares                     0    
Unamortized fair value stock based compensation     17,100,000               $ 17,100,000    
Weighted average remaining recognition period                     2 years 6 months    
Research Service Revenue [Member] | Customer Concentration Risk [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Customer accounted for percentage                     3.00%    
Accounts Receivable [Member] | Credit Concentration Risk [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Customer accounted for percentage                     6.00%    
ASU No. 2018-02 [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Reclassification adjustment to retained earnings for tax effects   $ 26,000                      
ASC 606 [Member] | Initial Application Period Cumulative Effect Transition [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Deferred revenue     7,800,000               $ 7,800,000    
Prepaid expenses and other current assets     (5,500,000)               (5,500,000)    
Deferred commissions     900,000               900,000    
Other assets     600,000               600,000    
Retained earnings     3,800,000               3,800,000    
ASC 606 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Deferred revenue     (14,000,000)               (14,000,000)    
Total assets     (8,800,000)               (8,800,000)    
Total revenues                     (1,600,000)    
Net income                     $ (1,400,000)    
Diluted income per common share | $ / shares                     $ 0.08    
SiriusDecisions, Inc [Member] | Subsequent Event [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Percentage of issued and outstanding shares acquired 100.00%                        
Cash paid $ 247,300,000                        
Minimum [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Number of consumers and business leaders included in annual surveys | ConsumerandBusinessLeader                     675,000    
Advisory services period                     1 hour    
Consulting services period                     14 days    
Minimum [Member] | ASU No. 2016-02 [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Right-of-use asset     50,000,000               $ 50,000,000    
Liability     58,000,000               $ 58,000,000    
Maximum [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Advisory services period                     2 days    
Consulting services period                     3 months    
Contract with customer, expected payment term                     one year    
Maximum [Member] | ASU No. 2016-02 [Member]                          
Summary Of Significant Accounting Policy [Line Items]                          
Right-of-use asset     54,000,000               $ 54,000,000    
Liability     $ 62,000,000               $ 62,000,000