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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