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Network
100400 - Disclosure - Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail)
(http://www.forrester.com/20161231/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsSummaryOfIntangibleAssetsDetail)
TableSchedule Of Finite Lived Intangible Assets [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001023313 (http://www.sec.gov/CIK)
Finite Lived Intangible Assets [Line Items]Period [Axis]
2016-12-31
2015-12-31
Finite-Lived Intangible Assets by Major ClassFinite-Lived Intangible Assets by Major Class
Customer Relationships [Member]Research Content [Member]Finite-Lived Intangible Assets, Major Class NameCustomer Relationships [Member]Research Content [Member]Technology [Member]Finite-Lived Intangible Assets, Major Class Name
Gross Carrying Amount
30,998,000  
1,083,000  
32,081,000  
32,270,000  
3,583,000  
1,507,000  
37,360,000  
Accumulated Amortization
29,534,000  
1,083,000  
30,617,000  
29,936,000  
3,583,000  
1,507,000  
35,026,000  
Total
1,464,000  
 
 
 
1,464,000  
 
2,334,000  
 
 
 
 
 
2,334,000