XML 44 R21.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Income Taxes (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2012
Income Taxes |
Schedule of Income tax provision and the respective effective tax rates |
|  | For the Three Months ended |  | For the Six Months ended |
|  | June 30, |  | June 30, |
|  | 2012 |  | 2011 |  | 2012 |  | 2011 |
Income tax provision |  | $ | 11,951 |  | $ | 11,049 |  | $ | 18,566 |  | $ | 21,464 |
Effective income tax rate |  | 17.9 | % | 17.9 | % | 15.2 | % | 18.9 | %

X
- Definition Tabular disclosure of the components of income tax expense and effective income tax rate attributable to continuing operations. + References No definition available. + Details
Name: | int_ScheduleOfIncomeTaxExpenseBenefitAndEffectiveIncomeTaxRateTableTextBlock
Namespace Prefix: | int_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration