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Business Segments (Reconciliation of Significant Reconciling Items) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Net sales | $ 137,907 us-gaap_SalesRevenueGoodsNet | $ 111,414 us-gaap_SalesRevenueGoodsNet
Segment Profit | 9,258 us-gaap_OperatingIncomeLoss | 7,118 us-gaap_OperatingIncomeLoss
Rail Products and Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 77,676 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 73,496 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Segment Profit | 6,072 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 5,316 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Construction Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 34,290 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 27,383 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Segment Profit | 1,228 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 1,216 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Tubular and Energy Services Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 25,941 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | 10,535 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Segment Profit | $ 1,958 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | $ 586 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember

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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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