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Commitments and Contingencies - Employment Agreements (Details) $ in Millions | 1 Months Ended
--- | ---
Mar. 31, 2015 USD ($)
Commitments and Contingencies |
Charges in connection with termination of employment agreement | $ 3.8
Non-cash expenses related to stock award compensation | $ 0.8

X
- Definition Represents the amount of non-cash expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement. + References No definition available. + Details
Name: | int_SeveranceCostsNonCash
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expenses for special or contractual termination benefits provided to current employees terminated under a severance arrangement. + References No definition available. + Details
Name: | int_SeveranceTerminationCosts
Namespace Prefix: | int_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration