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Commitments and Contingencies (Details 2) (USD $)	12 Months Ended	1 Months Ended
	Dec. 31, 2014	May 31, 2014
Agreements with Executive Officers and Key Employees
Future minimum commitments under agreements with executive officers and key employees
2015	$ 5,815,000int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearOne / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember
2016	1,540,000int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearTwo / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember
2017	750,000int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearThree / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember
2018	2,250,000int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployeesYearFour / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember
Total	10,355,000int_FutureMinimumCommitmentsUnderAgreementsWithExecutiveOfficersAndKeyEmployees / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_AgreementsWithExecutiveOfficersAndKeyEmployeesMember
Kasbar agreement
Loss contingencies
Annual base salary	750,000int_LossContingencyAnnualBaseSalaryUnderAgreement / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_KasbarAgreementMember
Term of extension in expiration period under the specified condition	1 year
Minimum period prior to expiration of the term for serving specified notice to prevent extension of the agreement term	1 year
Severance payment for termination following a change of control	5,000,000int_LossContingencySeverancePaymentForEmploymentTerminationFollowingChangeOfControl / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_KasbarAgreementMember
Severance payment for termination following other scenarios	3,000,000int_LossContingencySeverancePaymentForEmploymentTerminationFollowingOtherScenarios / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_KasbarAgreementMember
Period for severance payment after termination of executive's employment	2 years
Stebbins agreement
Executive Non-renewal Charge
Charges in connection with the non-renewal of agreement		4,800,000int_SeveranceTerminationCosts / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_StebbinsAgreementMember
Non-cash expenses related to stock award compensation		1,100,000int_SeveranceCostsNonCash / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_StebbinsAgreementMember
Accrued expenses and other current liabilities | Stebbins agreement
Executive Non-renewal Charge
Unpaid amount of cash portion of the executive non-renewal charge	900,000int_SeveranceCostsCashAccrual / us-gaap_BalanceSheetLocationAxis = int_AccruedExpensesAndOtherCurrentLiabilitiesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_StebbinsAgreementMember
Other long-term liabilities | Stebbins agreement
Executive Non-renewal Charge
Unpaid amount of cash portion of the executive non-renewal charge	$ 2,300,000int_SeveranceCostsCashAccrual / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = int_StebbinsAgreementMember

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- Details

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- Definition

The aggregate estimated commitment expense expected to be paid by the entity for succeeding fiscal years.

+ References

No definition available.

+ Details

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- Definition

The amount of commitment expense expected to be paid during year four of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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- Definition

The amount of commitment expense expected to be paid during year one of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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- Definition

The amount of commitment expense expected to be paid during year three of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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- Definition

The amount of commitment expense expected to be paid during year two of the five succeeding fiscal years.

+ References

No definition available.

+ Details

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- Definition

Represents the term of extension in the expiration period of the agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the minimum period prior to expiration of the term for serving the specified notice to prevent extension of the agreement term.

+ References

No definition available.

+ Details

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- Definition

Represents the annual base salary under the agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the period for severance payment after termination of the executive's employment under the agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of severance payment for termination of the executive's employment following a change in control under the agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of severance payment for termination of the executive's employment following other scenarios.

+ References

No definition available.

+ Details

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- Definition

Represents the unpaid amount of cash severance expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

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- 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

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

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