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Business Segments, Geographic Information, and Major Customers (Details 4) (Consolidated revenue, Customer)	Dec. 31, 2011
Consolidated revenue | Customer
Major Customers
Percentage required for qualification	10.00%

X

- Definition

Threshold percentage which the entity uses for disclosure.

+ References

No definition available.

+ Details

Name:	int_ThresholdForDisclosurePercentage
Namespace Prefix:	int_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration