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Discontinued Operations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
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Dec. 31, 2012 | Jun. 04, 2012 | Aug. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | $ 3,193 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax |  |
Shipping Systems Division [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal |  | On June 4, 2012, the Company sold substantially all of the assets and liabilities of its railway securement business, Shipping Systems Division (SSD) |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  | 8,579 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fstr_ShippingSystemsDivisionMember |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  | 3,508 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fstr_ShippingSystemsDivisionMember |
Goodwill, Written off Related to Sale of Business Unit | 2,588 us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fstr_ShippingSystemsDivisionMember |  |
Precise Structural Products Business [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Description and Timing of Disposal |  |  | On August 30, 2012, the Company sold substantially all of the assets and liabilities of its precise structural products business
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  | 2,643 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fstr_PreciseStructuralProductsBusinessMember
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax |  |  | $ (315)us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = fstr_PreciseStructuralProductsBusinessMember

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- Definition Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition A description of the facts and circumstances leading to the completed or expected disposal, and the manner and timing of that disposal. Sales of disposal groups, including those classified as components of the entity (discontinued operations), are generally expected to be completed within one year of their classification as held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.Z.5 Q2) -URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7384-122677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Z -Paragraph Question 2 -Subsection 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section U + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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