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Business Segments (Assets by Segment) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Segment Reporting Information [Line Items] |  |
Assets | $ 695,726 us-gaap_Assets | $ 495,121 us-gaap_Assets
Less: LIFO reserve | (8,295)us-gaap_InventoryLIFOReserve | (8,289)us-gaap_InventoryLIFOReserve
Rail Products and Services Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 248,870 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember | 239,951 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fstr_RailProductsSegmentMember
Construction Products Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 93,617 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember | 102,978 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fstr_ConstructionProductsSegmentMember
Tubular and Energy Services Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 323,472 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember | 130,289 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = fstr_TubularProductsSegmentsMember
Unallocated Corporate Assets [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 38,062 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | $ 30,192 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 6 -Subparagraph c -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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