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v2.4.1.9

Subsequent Event - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 6 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2015 | Jun. 30, 2015 | Feb. 11, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Percentage of workforce reduction |  | 1.00%forr_PercentageOfWorkforceReduction | 2.50%forr_PercentageOfWorkforceReduction |  |  |  |
Expected pre-tax expenses related to cash severance and employee termination benefit cost | $ 0.4 us-gaap_SeveranceCosts1 | $ 1.8 us-gaap_SeveranceCosts1 | $ 1.9 us-gaap_SeveranceCosts1 | $ 1.4 us-gaap_SeveranceCosts1 |  |  |
Forecast [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected increase in the workforce |  |  |  |  | 7.00%forr_PercentageIncreaseInWorkforce / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |
Minimum [Member] | Forecast [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected pre-tax expenses related to cash severance and employee termination benefit cost |  |  |  |  |  | 3.5 us-gaap_SeveranceCosts1 / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Maximum [Member] | Forecast [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Expected pre-tax expenses related to cash severance and employee termination benefit cost |  |  |  |  |  | $ 4.0 us-gaap_SeveranceCosts1 / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Subsequent Event [Member] |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Percentage of workforce reduction |  |  |  |  |  |  | 4.00%forr_PercentageOfWorkforceReduction / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Number of planned positions increase expressed as a percentage of the total workforce. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Number of positions eliminated as a consequence of restructuring plans expressed as a percentage of the total workforce. + References No definition available. + Details
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Namespace Prefix: | forr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |