XML 26 R36.htm IDEA: XBRL DOCUMENT
v2.4.0.6

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
Name: | int_EarnOutAbstract
Namespace Prefix: | int_
Data Type: | xbrli:stringItemType
Balance Type: | na
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:durationItemType
Balance Type: | na
Period Type: | duration

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