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Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 57,781 us-gaap_Goodwill | $ 41,237 us-gaap_Goodwill
Acquisitions | 25,209 us-gaap_GoodwillAcquiredDuringPeriod | 16,544 us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation impact | (41)us-gaap_GoodwillTranslationAdjustments |
Goodwill, Ending Balance | 82,949 us-gaap_Goodwill | 57,781 us-gaap_Goodwill
Rail Products Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 38,026 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 38,026 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Acquisitions | 971 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Foreign currency translation impact | (41)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember |
Goodwill, Ending Balance | 38,956 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 38,026 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Construction Products Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 3,211 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 3,211 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Acquisitions | 1,936 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 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 | 3,211 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Tubular Products Segments [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 16,544 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Acquisitions | 22,302 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | 16,544 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Foreign currency translation impact | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember |
Goodwill, Ending Balance | $ 38,846 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | $ 16,544 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember

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