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Acquisitions - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 06, 2018 | Jun. 22, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 85,126,000 | $ 85,126,000 | $ 76,169,000
Increase (decrease) in goodwill |  |  |  | 9,000,000 |
Decrease in goodwill due to foreign currency fluctuations |  |  |  | $ 800,000 |
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 | $ 9,087,000 |  |  |  |
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 |  |  | 500,000 |  |
Direct expenses |  |  | 1,100,000 |  |
Acquisition costs recognized |  |  | $ 100,000 | $ 400,000 |
SocialGlimpz Inc and FeedbackNow [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Increase (decrease) in goodwill |  |  |  | $ 9,800,000 |

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