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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified | 0 Months Ended |
--- | --- | ---
Mar. 16, 2015 | Mar. 31, 2015
Termination of Employment Agreement |  |
Charges in connection with termination of employment agreement | $ 3.0 int_SeveranceTerminationCosts |
Non-cash expenses related to stock award compensation | 0.8 int_SeveranceCostsNonCash |
Accrued expenses and other current liabilities |  |
Termination of Employment Agreement |  |
Unpaid amout of cash portion of charges related to termination of employment agreement |  | 1.0 int_SeveranceCostsCashAccrual / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember
Other long-term liabilities |  |
Termination of Employment Agreement |  |
Unpaid amout of cash portion of charges related to termination of employment agreement |  | $ 2.0 int_SeveranceCostsCashAccrual / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember

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

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

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=int_AccruedExpensesAndOtherCurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |