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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Earn-out
Payment of earn-out liability		4,304
2009 Acquisitions
Earn-out
Number of years over which certain operating income targets must be achieved		3 years
Payment of earn-out liability	$ 4,300

X

- Details

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Namespace Prefix:	int_
Data Type:	xbrli:stringItemType
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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_
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X

- Definition

Cash outflow representing an adjustment to the purchase price of a previous acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForPreviousAcquisition
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration