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Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets, Gross | $ 95,771 us-gaap_FiniteLivedIntangibleAssetsGross | $ 60,967 us-gaap_FiniteLivedIntangibleAssetsGross |
Amortization of Intangible Assets | 4,695 us-gaap_AmortizationOfIntangibleAssets | 3,112 us-gaap_AmortizationOfIntangibleAssets | 2,961 us-gaap_AmortizationOfIntangibleAssets
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Weighted Average [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 16 years |  |
Rail Products Segment [Member] |  |  |
Finite-Lived Intangible Assets, Gross | 44,781 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 44,455 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember |
Construction Products Segment [Member] |  |  |
Finite-Lived Intangible Assets, Gross | 3,178 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 1,830 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember |
Tubular Products Segments [Member] |  |  |
Finite-Lived Intangible Assets, Gross | $ 47,812 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | $ 14,682 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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