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Commitments and Contingencies (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
U.S. defined contribution plan |  |
Deferred Compensation Plans |  |
Employer match for each 1% of the participants contributions up to 6% of the participants contributions (as a percent) | 50.00%int_DefinedContributionPlanEmployerMatch / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = int_UnitedStatesDefinedContributionPlansMember |
Percentage of eligible compensation up to 6% of the eligible compensation, matched 50% by employer | 1.00%int_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = int_UnitedStatesDefinedContributionPlansMember |
Employer contribution limit per calendar year (as a percent of compensation) | 6.00%int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = int_UnitedStatesDefinedContributionPlansMember |
NQDC plan |  |
Deferred Compensation Plans |  |
Deferred compensation payable | 2.3 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = int_NonqualifiedDeferredCompensationPlanMember | $ 0.9 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = int_NonqualifiedDeferredCompensationPlanMember

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- Definition The limit of annual employer contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
Name: | int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation
Namespace Prefix: | int_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the employer matching contributions for the employees' contributions. + References No definition available. + Details
Name: | int_DefinedContributionPlanEmployerMatch
Namespace Prefix: | int_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | int_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | int_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | int_DefinedContributionPlansLineItems
Namespace Prefix: | int_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis=int_NonqualifiedDeferredCompensationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis=int_UnitedStatesDefinedContributionPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |