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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 06, 2018
Jun. 22, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill     $ 85,165,000 $ 85,165,000 $ 76,169,000 $ 73,193,000
Increase to goodwill     $ 400,000      
Increase (decrease) in goodwill       9,000,000    
Decrease in goodwill due to foreign currency fluctuations       $ 1,182,000 $ (2,976,000)  
SocialGlimpz Inc. [Member]            
Business Acquisition [Line Items]            
Acquisition date   Jun. 22, 2018        
Name of the business entity acquired       SocialGlimpz Inc.    
Description of acquired entity       On June 22, 2018, Forrester acquired substantially all of the assets of SocialGlimpz Inc. (“GlimpzIt”), an artificial intelligence and machine-learning provider based in San Francisco. The acquisition is part of Forrester's plan to build a real-time customer experience or CX cloud solution, integrating a range of inputs to help companies monitor and improve customer experience. Forrester intends to deploy the GlimpzIt technology to extend the analytics engine in Forrester’s planned real-time CX cloud.    
Purchase price paid   $ 1,300,000        
Goodwill   700,000        
Cash contingent to be paid on achievement of certain employment conditions   $ 300,000        
Compensation expense to be recognized over related service period of employees   2 years        
SocialGlimpz Inc. [Member] | Technology [Member]            
Business Acquisition [Line Items]            
Intangible assets   $ 600,000        
Estimated useful life   5 years        
FeedbackNow [Member]            
Business Acquisition [Line Items]            
Acquisition date Jul. 06, 2018          
Purchase price paid $ 8,425,000          
Goodwill $ 9,513,000          
Percentage of shares acquired 100.00%          
Acquisition price due and subject to indemnity provisions from seller $ 1,485,000          
Additional purchase price payable based on acquired working capital $ 798,000          
Balance acquisition price payable period 2 years          
Maximum consideration payable based on the financial performance of acquired company $ 4,200,000          
Revenue       $ 1,200,000    
Direct expenses       1,900,000    
Acquisition costs recognized       1,800,000    
SocialGlimpz Inc and FeedbackNow [Member]            
Business Acquisition [Line Items]            
Increase (decrease) in goodwill       $ 10,200,000