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v3.7.0.1

Segment Information (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment ft | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |
Number of reportable segments | segment | 4 |
Investigation-related matters | $ 1,039 | $ 1,890
Employee stock purchase plan expense |  | $ 100
Maximum | Tubular Sales |  |
Segment Reporting Information [Line Items] |  |
Length of tubulars used as caissons or pilings (in feet) (up to) | ft | 300 |

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- Definition Employee Stock Purchase Plan Expense + References No definition available. + Details
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Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Investigation-Related Matters Expense + References No definition available. + Details
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Namespace Prefix: | fi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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