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Acquisitions (Identifiable Intangible Assets Acquired) (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended
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Jan. 13, 2015 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014
Tew Holdings, LTD [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | $ 14,048 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Tew Holdings, LTD [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 870 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |
Tew Holdings, LTD [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 10,035 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Tew Holdings, LTD [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 2,480 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  |  |
Tew Holdings, LTD [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired | 663 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 33,130 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Chemtec Energy Services, LLC [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 3,149 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |
Chemtec Energy Services, LLC [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 23,934 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Chemtec Energy Services, LLC [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 4,930 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  |
Chemtec Energy Services, LLC [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | 1,117 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |
FWO [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 419 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
FWO [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 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] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 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] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 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] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 44 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |
Carr Concrete [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 1,348 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Carr Concrete [Member] | Trade name [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 613 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Carr Concrete [Member] | Customer relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 524 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Carr Concrete [Member] | Technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | 87 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember
Carr Concrete [Member] | Non-compete agreements [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  | $ 124 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember

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