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v3.10.0.1

Segment Information (Details) | 9 Months Ended
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Sep. 30, 2018 segment ft
Segment Reporting Information [Line Items] |
Number of reportable segments | segment | 4
Maximum | Tubular Sales |
Segment Reporting Information [Line Items] |
Length of tubulars used as caissons or pilings (in feet) (up to) | ft | 300

X
- Definition Length of Tubulars used as Caissons and Pilings + References No definition available. + Details
Name: | fi_LengthofTubularsusedasCaissonsandPilings
Namespace Prefix: | fi_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=fi_TubularSalesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |