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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Goodwill [Line Items] |
Goodwill, Beginning Balance | $ 82,949 us-gaap_Goodwill
Acquisitions | 132,491 us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation impact | (310)us-gaap_GoodwillTranslationAdjustments
Goodwill, Ending Balance | 215,130 us-gaap_Goodwill
Rail Products and Services Segment [Member] |
Goodwill [Line Items] |
Goodwill, Beginning Balance | 38,956 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Acquisitions | 9,079 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Foreign currency translation impact | (310)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Goodwill, Ending Balance | 47,725 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Construction Products Segment [Member] |
Goodwill [Line Items] |
Goodwill, Beginning Balance | 5,147 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Foreign currency translation impact | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Goodwill, Ending Balance | 5,147 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Tubular and Energy Services Segments [Member] |
Goodwill [Line Items] |
Goodwill, Beginning Balance | 38,846 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Acquisitions | 123,412 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Foreign currency translation impact | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Goodwill, Ending Balance | $ 162,258 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember

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- Definition Amount after accumulated impairment loss 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 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments 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 (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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