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Income Taxess (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
U.S. and foreign income before income taxes      
United States $ 56,575,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 31,823,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 49,021,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign 212,976,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 214,842,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 190,574,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes 269,551,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 246,665,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 239,595,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current:      
U.S. federal statutory tax 14,829,000us-gaap_CurrentFederalTaxExpenseBenefit 8,167,000us-gaap_CurrentFederalTaxExpenseBenefit 6,858,000us-gaap_CurrentFederalTaxExpenseBenefit
State 2,540,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 1,822,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 938,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 22,016,000us-gaap_CurrentForeignTaxExpenseBenefit 36,254,000us-gaap_CurrentForeignTaxExpenseBenefit 24,649,000us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax provision (benefit) 39,385,000us-gaap_CurrentIncomeTaxExpenseBenefit 46,243,000us-gaap_CurrentIncomeTaxExpenseBenefit 32,445,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
U.S. federal statutory tax 10,707,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 2,171,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 7,642,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 2,674,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 566,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,380,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign (3,030,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (10,980,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 643,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred income (loss) before income taxes 10,351,000us-gaap_DeferredIncomeTaxExpenseBenefit (8,243,000)us-gaap_DeferredIncomeTaxExpenseBenefit 9,665,000us-gaap_DeferredIncomeTaxExpenseBenefit
Non-current tax expense (income) 1,408,000int_NoncurrentIncomeTaxExpenseBenefit 1,505,000int_NoncurrentIncomeTaxExpenseBenefit (3,866,000)int_NoncurrentIncomeTaxExpenseBenefit
Income tax provision 51,144,000us-gaap_IncomeTaxExpenseBenefit 39,505,000us-gaap_IncomeTaxExpenseBenefit 38,244,000us-gaap_IncomeTaxExpenseBenefit
Reconciliation of U.S. federal statutory income tax rate to effective income tax rate      
U.S. federal statutory tax rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign earnings, net of foreign taxes (as a percent) (18.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (18.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (16.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
State income taxes, net of U.S. federal income tax benefit (as a percent) 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other permanent differences (as a percent) 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther (2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Effective income tax rate (as a percent) 19.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 16.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 16.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective income tax rate, excluding gain on sale of crude oil joint venture interests (as a percent) 17.70%int_EffectiveIncomeTaxRateContinuingOperationsExcludingGainOnSaleOfJointVentureInterests    
Earnings attributable to foreign subsidiaries 1,300,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries 1,100,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Amount of income tax liability accrued $ 0us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries $ 0us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries