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Debt (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt
Total debt	$ 689,868us-gaap_DebtAndCapitalLeaseObligations	$ 463,711us-gaap_DebtAndCapitalLeaseObligations
Short-term debt	17,914us-gaap_DebtCurrent	14,647us-gaap_DebtCurrent
Long term-debt	671,954us-gaap_LongTermDebtAndCapitalLeaseObligations	449,064us-gaap_LongTermDebtAndCapitalLeaseObligations
Weighted average interest rate (as a percent)	2.20%us-gaap_ShortTermDebtWeightedAverageInterestRate	2.10%us-gaap_ShortTermDebtWeightedAverageInterestRate
Aggregate annual maturities of debt
2015	17,914us-gaap_LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths
2016	18,042us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo
2017	20,833us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree
2018	631,901us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour
2019	770us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter	408us-gaap_LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive
Interest income, expense and other financing costs
Interest income	5,993us-gaap_InterestIncomeOther	3,882us-gaap_InterestIncomeOther	908us-gaap_InterestIncomeOther
Interest expense and other financing costs	(31,230)us-gaap_InterestExpense	(21,169)us-gaap_InterestExpense	(20,005)us-gaap_InterestExpense
Interest expense and other financing costs, net	(25,237)int_InterestIncomeExpenseAndOtherFinancialCostsNet	(17,287)int_InterestIncomeExpenseAndOtherFinancialCostsNet	(19,097)int_InterestIncomeExpenseAndOtherFinancialCostsNet
Credit facility
Debt
Total debt	420,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember	200,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Term Loans
Debt
Total debt	241,288us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember	242,500us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Acquisition promissory notes
Debt
Total debt	12,635us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = int_AcquiredPromissoryNotesMember	13,403us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = int_AcquiredPromissoryNotesMember
Interest rate (as a percent)	1.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = int_AcquiredPromissoryNotesMember
Other
Debt
Total debt	$ 15,945us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = int_OtherDebtMember	$ 7,808us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = int_OtherDebtMember
Interest rate, minimum (as a percent)	2.20%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = int_OtherDebtMember
Interest rate, maximum (as a percent)	6.30%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = int_OtherDebtMember

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- Definition

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 210

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of interest income earned from interest bearing assets not separately disclosed.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Principal amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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No definition available.

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Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Weighted average interest rate of short-term debt outstanding.

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