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Fair Value Measurements (Details 3) (2009 Acquisitions, USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 Y | Mar. 31, 2011
2009 Acquisitions |  |
Earn-out |  |
Number of years over which certain operating income targets must be achieved | 3 |
Fair value of the earn-out liability | $ 4.3 | $ 5.2
Change in unrealized gains relating to foreign currency translation | $ 0.1 | $ 0.1

X
- Definition Fair value, as of the balance sheet date, of potential payments under the contingent consideration arrangement. + References No definition available. + Details
Name: | int_BusinessAcquisitionContingentConsiderationFairValueDisclosure
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Represents the change in unrealized gains (losses) using significant unobservable inputs (level 3), relating to foreign currency translation. + References No definition available. + Details
Name: | int_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesUnrealizedGainLossesRelatedToForeignCurrencyTranslation
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of years over which certain operating income targets must be achieved by the entity for the purchase price to increase. + References No definition available. + Details
Name: | int_NumberOfYearsOverWhichCertainOperatingIncomeTargetsMustBeAchieved
Namespace Prefix: | int_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration