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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Goodwill by Segment and Changes in Carrying Amount of Goodwill | A summary of the goodwill by segment and the changes in the carrying amount of goodwill is shown in the following table (in thousands).
|  |  |  |  |  |  |  |  | Project |  |  |  |  |
| Product |  |  | Research |  |  | Consulting |  |  | Total |
Balance at January 1, 2016 | $ | 2,371 |  |  | $ | 71,700 |  |  | $ | — |  |  | $ | 74,071 |
Translation adjustments |  | (28 | ) |  |  | (850 | ) |  |  | — |  |  |  | (878 | )
Balance at December 31, 2016 |  | 2,343 |  |  |  | 70,850 |  |  |  | — |  |  |  | 73,193 |
Translation adjustments |  | 95 |  |  |  | 2,881 |  |  |  | — |  |  |  | 2,976 |
Balance at December 31, 2017 | $ | 2,438 |  |  | $ | 73,731 |  |  | $ | — |  |  | $ | 76,169 |
Summary of Intangible Assets | A summary of Forrester’s intangible assets is as follows (in thousands):
| December 31, 2017 |
| Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 31,735 |  |  | $ | 31,003 |  |  | $ | 732 |
Research content |  | 1,083 |  |  |  | 1,083 |  |  |  | — |
Total | $ | 32,818 |  |  | $ | 32,086 |  |  | $ | 732 |
| December 31, 2016 |
| Gross |  |  |  |  |  |  | Net |
| Carrying |  |  | Accumulated |  |  | Carrying |
| Amount |  |  | Amortization |  |  | Amount |
Amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 30,998 |  |  | $ | 29,534 |  |  | $ | 1,464 |
Research content |  | 1,083 |  |  |  | 1,083 |  |  |  | — |
Total | $ | 32,081 |  |  | $ | 30,617 |  |  | $ | 1,464 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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