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Acquisitions (Identifiable Intangible Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended
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Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014 | Nov. 07, 2013
Chemtec [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets | $ 33,130 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember |  |  |
Chemtec [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 3,149 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |
Chemtec [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 23,934 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Chemtec [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 4,930 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  |  |
Chemtec [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets | 1,117 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtechMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |
FWO [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 419 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |  |
FWO [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |
FWO [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 34 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
FWO [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 341 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  |
FWO [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  | 44 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |
Carr Concrete Corporation [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 1,348 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteCorporationMember |
Carr Concrete Corporation [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 613 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Carr Concrete Corporation [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 524 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Carr Concrete Corporation [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 87 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |
Carr Concrete Corporation [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  | 124 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
L.B. Foster Ball Winch, Inc. [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 14,682 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember
L.B. Foster Ball Winch, Inc. [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 723 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
L.B. Foster Ball Winch, Inc. [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 0 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
L.B. Foster Ball Winch, Inc. [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | 11,129 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
L.B. Foster Ball Winch, Inc. [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Fair value estimate of acquired identifiable intangible assets |  |  |  | $ 2,830 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_LBFosterBallWinchIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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