XML 54 R38.htm IDEA: XBRL DOCUMENT v3.19.2
Acquisitions - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jan. 03, 2019
USD ($)
Employee
Jul. 06, 2018
USD ($)
Jun. 22, 2018
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 06, 2018
CHF (SFr)
Business Acquisition [Line Items]                    
Goodwill       $ 242,265,000   $ 242,265,000     $ 85,165,000  
Additional purchase price paid           766,000        
SiriusDecisions, Inc [Member]                    
Business Acquisition [Line Items]                    
Revenue       27,500,000   42,700,000        
Direct expenses including intangible amortization       32,000,000   $ 57,000,000        
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              
Cash contingent paid on achievement of certain employment conditions           $ 100,000        
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   $ 8,400,000                
Percentage of issued and outstanding shares acquired   100.00%               100.00%
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   4,300,000   $ 4,300,000   4,300,000       SFr 4,200,000
Business acquisition undiscounted amounts could be payable, minimum   1,800,000                
Contingent purchase price   $ 3,400,000                
FeedbackNow [Member] | Scenario, Forecast [Member]                    
Business Acquisition [Line Items]                    
Additional consideration payable to sellers based on financial performance               $ 1,800,000    
FeedbackNow [Member] | Scenario, Forecast [Member] | Maximum [Member]                    
Business Acquisition [Line Items]                    
Additional consideration payable to sellers based on financial performance             $ 2,500,000 $ 1,800,000    
SiriusDecisions, Inc [Member]                    
Business Acquisition [Line Items]                    
Purchase price paid $ 246,801,000                  
Goodwill $ 157,161,000                  
Percentage of issued and outstanding shares acquired 100.00%                  
Number of employees | Employee 350                  
Consideration paid $ 245,000,000                  
Acquisition costs recognized         $ 1,700,000 $ 1,700,000