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Acquisitions - Additional Information (Detail) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 03, 2019 USD ($) Employee | Jul. 06, 2018 USD ($) | Jun. 22, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 247,211 | $ 243,895 | $ 85,165
Cash contingent paid on achievement of certain employment conditions |  |  |  | 200 | 100 |
Acquisition and integration costs |  |  |  | 5,779 | 8,948 | 3,787
Sirius Decisions Segment [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 142,500 |  |  |  | 142,584 |
Research Segment [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 16,000 |  |  | 238,913 | 101,311 | $ 72,647
SiriusDecisions, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue |  |  |  |  | 79,300 |
Direct expenses including intangible amortization |  |  |  |  | 103,900 |
SiriusDecisions, Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of issued and outstanding shares acquired | 100.00% |  |  |  |  |
Number of employees | Employee | 350 |  |  |  |  |
Consideration paid | $ 245,000 |  |  |  |  |
Purchase price paid | 246,801 |  |  |  |  |
Goodwill | $ 158,569 |  |  |  |  |
FeedbackNow [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of issued and outstanding shares acquired |  | 100.00% |  |  |  |
Purchase price paid |  | $ 8,425 |  | $ 2,700 | $ 1,800 |
Goodwill |  | $ 9,513 |  |  |  |
Acquisition date |  | Jul. 06, 2018 |  |  |  |
Balance acquisition price payable period |  | 2 years |  |  |  |
SocialGlimpz Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price paid |  |  | $ 1,300 |  |  |
Goodwill |  |  | $ 700 |  |  |
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 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. |  |
Cash contingent to be paid on achievement of certain employment conditions |  |  | $ 300 |  |  |
SocialGlimpz Inc. [Member] | Technology [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangible assets |  |  | $ 600 |  |  |
Estimated useful life |  |  | 5 years |  |  |

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