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Accounts Receivable (Segment Trade Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, net - segment | $ 89,458 us-gaap_AccountsReceivableNetCurrent | $ 97,375 us-gaap_AccountsReceivableNetCurrent
Rail Products Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, net - segment | 45,931 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 57,342 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Construction Products Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, net - segment | 33,760 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 35,711 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Tubular Products Segments [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable, net - segment | $ 9,767 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | $ 4,322 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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