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Commitments and Contingencies - Employment Agreements (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2016
Executive Non-renewal Charge |  |
Charges in connection with the non-renewal of agreement | $ 3,800,000 |
Non-cash expenses related to stock award compensation | $ 800,000 |
Kasbar agreement |  |
Loss contingencies |  |
Annual base salary |  | $ 900,000
Term of extension in expiration period under the specified condition |  | 1 year
Minimum period prior to expiration of the term for serving specified notice to prevent extension of the agreement term |  | 1 year
Severance payment for termination following a change of control |  | $ 5,000,000
Severance payment for termination following other scenarios |  | $ 3,000,000
Period for severance payment after termination of executive's employment |  | 2 years
Agreements with executive officers and key employees |  |
Future minimum commitments under agreements with executive officers and key employees |  |
2017 |  | $ 1,300,000

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- Definition Executive Non-renewal Charge [Abstract] + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesAbstract
Namespace Prefix: | int_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of commitment expense expected to be paid during year one of the five succeeding fiscal years. + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the term of extension in the expiration period of the agreement. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the minimum period prior to expiration of the term for serving the specified notice to prevent extension of the agreement term. + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the annual base salary under the agreement. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the period for severance payment after termination of the executive's employment under the agreement. + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of severance payment for termination of the executive's employment following a change in control under the agreement. + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of severance payment for termination of the executive's employment following other scenarios. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of non-cash expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement. + References No definition available. + Details
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Balance Type: | debit
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- Definition Amount of expenses for special or contractual termination benefits provided to current employees terminated under a severance arrangement. + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
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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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- Details
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