XML 51 R40.htm IDEA: XBRL DOCUMENT
v3.23.2

Business Segments - Narrative (Details) - USD ($) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Mar. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2022
Segment Reporting Information |  |  |  |
Proceeds from business dispositions |  |  | $ 7,706 | $ 1,195
Loss (gain) on asset divestitures |  |  | $ 3,074 | $ (491)
Rail Products |  |  |  |
Segment Reporting Information |  |  |  |
Proceeds from business dispositions | $ 2,368 |  |  |
Loss (gain) on asset divestitures | $ 1,009 | $ 2,065 |  |
Coatings and Measurement |  |  |  |
Segment Reporting Information |  |  |  |
Proceeds from business dispositions |  | $ 5,344 |  |

X
- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481203/810-10-50-1B + Details
Name: | us-gaap_GainLossOnSaleOfBusiness
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-12 + Details
Name: | us-gaap_ProceedsFromDivestitureOfBusinesses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ReportingUnitAxis=fstr_RailProductsBusinessUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReportingUnitAxis=fstr_CoatingsAndMeasurementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |