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Commitments and Contingent Liabilites (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Standard Product Warranty Accrual | $ 11,500 us-gaap_StandardProductWarrantyAccrual |  |  |  | $ 7,483 us-gaap_StandardProductWarrantyAccrual |  |  |  | $ 11,500 us-gaap_StandardProductWarrantyAccrual | $ 7,483 us-gaap_StandardProductWarrantyAccrual | $ 15,727 us-gaap_StandardProductWarrantyAccrual
Sales Revenue, Goods, Net | 161,149 us-gaap_SalesRevenueGoodsNet | 167,797 us-gaap_SalesRevenueGoodsNet | 166,832 us-gaap_SalesRevenueGoodsNet | 111,414 us-gaap_SalesRevenueGoodsNet | 156,458 us-gaap_SalesRevenueGoodsNet | 162,248 us-gaap_SalesRevenueGoodsNet | 149,936 us-gaap_SalesRevenueGoodsNet | 129,321 us-gaap_SalesRevenueGoodsNet | 607,192 us-gaap_SalesRevenueGoodsNet | 597,963 us-gaap_SalesRevenueGoodsNet | 588,541 us-gaap_SalesRevenueGoodsNet
Property, Plant and Equipment, Net | 74,802 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 50,109 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 74,802 us-gaap_PropertyPlantAndEquipmentNet | 50,109 us-gaap_PropertyPlantAndEquipmentNet |
Tucson, AZ [Member] |  |  |  |  |  |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales Revenue, Goods, Net |  |  |  |  |  |  |  |  | 15,297 us-gaap_SalesRevenueGoodsNet / us-gaap_SubsegmentsAxis = fstr_TucsonAzMember | 12,664 us-gaap_SalesRevenueGoodsNet / us-gaap_SubsegmentsAxis = fstr_TucsonAzMember | 25,441 us-gaap_SalesRevenueGoodsNet / us-gaap_SubsegmentsAxis = fstr_TucsonAzMember
Property, Plant and Equipment, Net | 978 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_SubsegmentsAxis = fstr_TucsonAzMember |  |  |  |  |  |  |  | 978 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_SubsegmentsAxis = fstr_TucsonAzMember |  |
Reserve for Concrete Ties [Member] |  |  |  |  |  |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  |  |  |  |  |  |  | 12,000 us-gaap_LitigationSettlementAmount / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember
Product Warranty Expense |  |  |  |  |  |  |  |  |  |  | 22,000 us-gaap_ProductWarrantyExpense / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember
Standard Product Warranty Accrual | 10,331 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember |  |  |  | 6,462 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember |  |  |  | 10,331 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember | 6,462 us-gaap_StandardProductWarrantyAccrual / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember |
Standard Product Warranty Accrual, Period Increase (Decrease) | 4,766 us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember |  | 4,000 us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember |  |  |  |  |  | 9,854 us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember | 612 us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember | 23,019 us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease / us-gaap_ValuationAllowancesAndReservesTypeAxis = fstr_ReserveForConcreteTiesMember
Reserve for Environmental Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Product Liability Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies | $ 3,344 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  |  |  | $ 2,190 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |  |  |  | $ 3,344 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember | $ 2,190 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ReserveForEnvironmentalCostsMember |

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