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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 22, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Purchase price paid |  | $ 1,289 |
Goodwill |  | $ 76,551 | $ 76,169
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 |  |
Goodwill | 1,000 |  |
Intangible assets | $ 300 |  |

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