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Acquisitions (Allocation of Purchase Price) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014 | Nov. 07, 2013
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 82,949 us-gaap_Goodwill | $ 57,781 us-gaap_Goodwill | $ 41,237 us-gaap_Goodwill |  |  |  |
Chemtec [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  | 15,528 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Other assets |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Property, plant and equipment |  |  |  | 4,705 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Goodwill |  |  |  | 22,302 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Other intangibles |  |  |  | 33,130 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Current liabilities |  |  |  | (6,756)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Total |  |  |  | 68,909 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
FWO [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  | 131 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
Other assets |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
Property, plant and equipment |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
Goodwill |  |  |  |  | 971 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
Other intangibles |  |  |  |  | 419 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
Current liabilities |  |  |  |  | (418)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
Total |  |  |  |  | 1,103 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
L.B. Foster Ball Winch, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  |  | 3,180 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | 1,857 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
Other assets |  |  |  |  |  | 45 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | 64 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
Property, plant and equipment |  |  |  |  |  | 7,648 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | 5,555 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
Goodwill |  |  |  |  |  | 1,936 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | 16,544 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
Other intangibles |  |  |  |  |  | 1,348 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | 14,682 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
Current liabilities |  |  |  |  |  | (1,677)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | (707)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
Total |  |  |  |  |  | $ 12,480 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember | $ 37,995 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember

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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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