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Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Blackhawk |  |
Segment Reporting Information [Line Items] |  |
Bonus and medical claim expenses | $ 1.6 | $ 3.2

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- Definition Bonus and Medical Claim Expenses + References No definition available. + Details
Name: | fi_BonusandMedicalClaimExpenses
Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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