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Segment Information (Details)	6 Months Ended
	Jun. 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:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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