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Acquisitions - Additional Information (Detail) |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 03, 2019 USD ($) Employee | Jul. 06, 2018 USD ($) | Jun. 22, 2018 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 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 |  |  |  | $ 238,826,000 |  |  | $ 238,826,000 |  |  | $ 85,165,000 |
SiriusDecisions, Inc [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  | 16,800,000 |  |  | 59,500,000 |  |  |  |
Direct expenses including intangible amortization |  |  |  | 22,200,000 |  |  | $ 79,200,000 |  |  |  |
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 |  |  |  |  | $ 500,000 |  |  |  |
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 |  | 2,500,000 |  | 4,300,000 |  |  | 4,300,000 |  |  |  | SFr 4,200,000
Additional consideration payable to sellers based on financial performance |  |  |  | $ 1,800,000 |  |  | 1,800,000 |  |  |  |
Business acquisition undiscounted amounts could be payable, minimum |  | 0 |  |  |  |  |  |  |  |  |
Contingent purchase price |  | $ 3,400,000 |  |  |  |  |  |  |  |  |
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 | $ 154,906,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |

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