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Income Taxes (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes      
Increase (decrease) in additional liabilities related to unrecognized tax liabilities $ (2,100,000)int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease $ 4,100,000int_UnrecognizedTaxLiabilitiesPeriodIncreaseDecrease  
Increase (decrease) in assets related to unrecognized tax assets (4,500,000)int_UnrecognizedTaxAssetsPeriodIncreaseDecrease 1,800,000int_UnrecognizedTaxAssetsPeriodIncreaseDecrease  
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense (500,000)int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease (100,000)int_UnrecognizedTaxLiabilitiesRelatedToForeignCurrencyTranslationExpensePeriodIncreaseDecrease  
Unrecognized Tax Liabilities 33,000,000int_UnrecognizedTaxLiabilities 36,200,000int_UnrecognizedTaxLiabilities  
Unrecognized Tax Assets 2,300,000int_UnrecognizedTaxAssets 6,900,000int_UnrecognizedTaxAssets  
Reconciliation of total amounts of unrecognized income tax benefits      
Unrecognized Tax Liabilities - opening balance 26,487,000us-gaap_UnrecognizedTaxBenefits 22,394,000us-gaap_UnrecognizedTaxBenefits 25,574,000us-gaap_UnrecognizedTaxBenefits
Gross increases - tax positions in prior period 65,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 2,559,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Gross decreases - tax positions in prior period (2,833,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (39,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (7,659,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Gross increases - tax positions in current period 6,636,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 4,999,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 5,730,000us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Settlements (3,597,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities    
Lapse of statute of limitations (2,414,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (3,426,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (1,251,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Unrecognized Tax Liabilities - ending balance 24,344,000us-gaap_UnrecognizedTaxBenefits 26,487,000us-gaap_UnrecognizedTaxBenefits 22,394,000us-gaap_UnrecognizedTaxBenefits
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor 22,000,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) 8.20%int_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRatePercentage    
Interest and penalties expense      
Interest related to unrecognized tax benefits, recorded as (income) expense (600,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense (600,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense (700,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense (300,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense (300,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense (1,500,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Accrued interest and penalties      
Accrued interest related to unrecognized tax benefits 4,200,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 4,900,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued  
Accrued penalties related to unrecognized tax benefits $ 4,500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued $ 4,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued