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Nature of Business, Acquisitions, Significant Accounting Policies and Recent Accounting Pronouncements (Details)
3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2014
USD ($)
bbl
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
Land Segment
USD ($)
Dec. 31, 2013
Land Segment
USD ($)
Dec. 31, 2012
Land Segment
USD ($)
Dec. 31, 2014
Marine segment
USD ($)
Dec. 31, 2013
Marine segment
USD ($)
Dec. 31, 2012
Marine segment
USD ($)
Dec. 31, 2013
Aviation Segment
USD ($)
Dec. 31, 2014
Aviation Segment
USD ($)
Dec. 31, 2012
Aviation Segment
USD ($)
Dec. 31, 2014
2014 Acquisitions
USD ($)
Dec. 31, 2013
2014 Acquisitions
USD ($)
Dec. 31, 2014
2014 Acquisitions
Trademark/Trade name rights
USD ($)
Dec. 31, 2014
2014 Acquisitions
Customer relationships
Mar. 07, 2014
2014 Acquisitions
Customer relationships
USD ($)
Dec. 31, 2014
2014 Acquisitions
Other
Mar. 07, 2014
2014 Acquisitions
Other
USD ($)
Dec. 31, 2014
2014 Acquisitions
Marine segment
item
Dec. 31, 2014
2014 Acquisitions
Aviation Segment
item
Mar. 07, 2014
2014 Acquisitions
Watson Petroleum
USD ($)
Mar. 07, 2014
2014 Acquisitions
Watson Petroleum
GBP (£)
Dec. 31, 2014
2014 Acquisitions
Watson Petroleum
USD ($)
Dec. 31, 2014
2014 Acquisitions
Watson Petroleum
GBP (£)
Mar. 07, 2014
2014 Acquisitions
Watson Petroleum
USD ($)
Mar. 07, 2014
2014 Acquisitions
Watson Petroleum
GBP (£)
Jul. 29, 2014
2014 Acquisitions
Colt
location
Dec. 31, 2013
2013 Acquisitions
USD ($)
Dec. 31, 2013
2013 Acquisitions
Land Segment
location
Dec. 31, 2013
2012 Acquisitions
USD ($)
Dec. 31, 2012
2012 Acquisitions
USD ($)
item
Dec. 31, 2012
2012 Acquisitions
Aviation Segment
item
Dec. 31, 2012
2012 Acquisitions
Multi Service Corporation
item
Sep. 01, 2012
2012 Acquisitions
Carter Energy Corporation
item
Acquisitions                                                                        
Number of locations                                                         3,000int_NumberOfLocations
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_ColtInternationalLLCMember
             
Number of acquisitions                                         1us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_StatementBusinessSegmentsAxis
= int_MarineSegmentMember
2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_StatementBusinessSegmentsAxis
= int_AviationSegmentMember
                3us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
/ us-gaap_StatementBusinessSegmentsAxis
= int_LandSegmentMember
  3us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
/ us-gaap_StatementBusinessSegmentsAxis
= int_AviationSegmentMember
   
Minimum number of truck stops for global fuel procurement and commercial payment programs                                                                     3,500int_BusinessAcquisitionMinimumNumberOfTruckStopsForGlobalFuelProcurementAndCommercialPaymentPrograms
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_MultiServiceCorporationMember
 
Minimum number of retail operators, to whom, acquired company distributes gasoline and diesel fuel                                                                       700int_BusinessAcquisitionMinimumNumberOfRetailOperatorsToWhomGasolineAndDieselFuelDistributed
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_CarterEnergyCorporationMember
Estimated purchase price of acquisition                                                                        
Estimated purchase price                           $ 296,962,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              $ 43,792,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    $ 226,449,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Less: Cash acquired                           20,232,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              3,335,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    12,793,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Estimated purchase price, net of cash acquired                           276,730,000int_BusinessCombinationPurchasePriceNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              40,457,000int_BusinessCombinationPurchasePriceNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    213,656,000int_BusinessCombinationPurchasePriceNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Less: Promissory notes issued   9,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred 3,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred 7,200,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred                   9,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              3,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    7,214,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Less: Amounts due to sellers                           12,228,000int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                    75,000int_BusinessCombinationConsiderationTransferredAmountDueFromToAcquiree
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Cash paid for acquisition of businesses                           255,502,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              37,457,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    206,367,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Reduction in goodwill   (411,000)us-gaap_GoodwillPurchaseAccountingAdjustments 2,006,000us-gaap_GoodwillPurchaseAccountingAdjustments   (411,000)us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= int_LandSegmentMember
8,506,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= int_LandSegmentMember
        (6,500,000)us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= int_AviationSegmentMember
                                        2,000,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
       
Decrease in identifiable intangible assets                                                               3,300,000us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
       
Decrease in other acquired assets                                                               900,000int_PurchaseAccountingAdjustmentsOtherAcquiredAssets
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
       
Increase in assumed liabilities                                                               400,000int_PurchaseAccountingAdjustmentsAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
       
Amounts paid to sellers                                                               17,500,000int_DecreaseInAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
       
Assets acquired:                                                                        
Cash and cash equivalents                           20,232,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              3,335,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    12,793,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Accounts receivable                           259,475,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              31,287,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    134,966,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Inventories                           14,412,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              8,839,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    7,311,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Property and equipment                           55,172,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              3,901,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    10,323,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Identifiable intangible assets                           78,889,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
  10,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= int_TrademarksTradeNamesRightsMember
  54,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  14,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
                  13,548,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    87,150,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Goodwill 656,078,000us-gaap_Goodwill 656,078,000us-gaap_Goodwill 483,591,000us-gaap_Goodwill 470,506,000us-gaap_Goodwill 404,867,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_LandSegmentMember
298,996,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_LandSegmentMember
291,243,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_LandSegmentMember
73,068,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_MarineSegmentMember
69,088,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_MarineSegmentMember
69,931,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_MarineSegmentMember
115,507,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_AviationSegmentMember
178,143,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_AviationSegmentMember
109,332,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= int_AviationSegmentMember
180,683,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              16,489,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    121,188,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Other current and long-term assets                           22,456,000int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              2,717,000int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    4,851,000int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherCurrentAndLongTermAssets
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Liabilities assumed:                                                                        
Accounts payable                           (247,579,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              (29,631,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    (130,297,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Accrued expenses and other current liabilities                           (51,579,000)int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              (3,582,000)int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    (18,321,000)int_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenseAndOtherCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Other long-term liabilities                           (15,751,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              (3,111,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    (3,515,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Initial noncontrolling interest upon acquisition of businesses                           (19,448,000)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                           
Estimate purchase price                           296,962,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                              43,792,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2013Member
    226,449,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2012Member
     
Escrow payment related to an assumed obligation of an acquired business   21,724,000us-gaap_IncreaseDecreaseInRestrictedCash                                         21,700,000us-gaap_IncreaseDecreaseInRestrictedCash
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
13,000,000us-gaap_IncreaseDecreaseInRestrictedCash
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
                       
Amounts due to sellers                                                 8,300,000int_BusinessCombinationAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
5,300,000int_BusinessCombinationAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
5,400,000int_BusinessCombinationAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
3,200,000int_BusinessCombinationAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
               
Additional estimated amounts due to seller                                                 3,500,000int_IncreaseDecreaseInAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
2,100,000int_IncreaseDecreaseInAmountsDueToSellers
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= int_WatsonPetroleumLimitedMember
                   
Goodwill anticipated to be deductible for tax purposes                           21,200,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                           
Weighted average amortizable lives of identifiable intangible assets                                 4 years 10 months 24 days   5 years 7 months 6 days                                  
Pro forma results                                                                        
Revenue                           44,071,793,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
44,098,881,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                         
Net income attributable to World Fuel                           226,608,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
216,429,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                         
Earnings per common share:                                                                        
Basic (in dollars per share)                           $ 3.20us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
$ 3.04us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                         
Diluted (in dollars per share)                           $ 3.18us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
$ 3.01us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= int_Acquisitions2014Member
                                         
Other Investments                                                                        
Investments made during the period   18,000,000int_IncreaseInOtherInvestments                                                                    
Proceeds from the sale of crude oil joint venture interests   43,000,000int_ProceedsFromSaleOfJointVentureInterests                                                                    
Sale of crude oil interests, future contingent payments ("operational overrides"), price per barrel   22.5int_SaleOfJointVentureInterestsFutureContingentPaymentsPerBarrel                                                                    
Maximum barrels per day used in the calculation of the future contingent payments to be recognized from the sale of crude oil joint venture interests.   80,000int_SaleOfJointVentureInterestsFutureContingentPaymentsMaximumBarrelsPerDay                                                                    
Discount rate to determine present value of future contingent payments (as a percent)   9.00%int_SaleOfJointVentureInterestsFutureContingentPaymentsPresentValueDiscountRate                                                                    
Present value of the maximum operational overrides 49,200,000int_SaleOfJointVentureInterestsFutureContingentPaymentsPresentValue 49,200,000int_SaleOfJointVentureInterestsFutureContingentPaymentsPresentValue                                                                    
Gain on sale of crude oil joint venture interests   18,082,000int_GainOnSaleOfJointVentureInterest                                                                    
Gain on sale of crude oil joint venture interest, net of tax and related operating expenses 9,900,000int_GainOnSaleOfJointVentureInterestNetOfTaxAndRelatedExpenses 9,900,000int_GainOnSaleOfJointVentureInterestNetOfTaxAndRelatedExpenses                                                                    
Per share impact on the gain on sale of joint venture interests, net of tax and related operating expenses $ 0.14int_GainOnSaleOfCrudeOilJointVentureInterestPerShareNetOfTaxAndRelatedOperatingExpenses $ 0.14int_GainOnSaleOfCrudeOilJointVentureInterestPerShareNetOfTaxAndRelatedOperatingExpenses                                                                    
Other investments 69,500,000us-gaap_EquityMethodInvestments 69,500,000us-gaap_EquityMethodInvestments 83,800,000us-gaap_EquityMethodInvestments                                                                  
Extinguishment of Liability                                                                        
Derecognized vendor liability accruals amount   5,300,000int_DerecognizedVendorLiabilityAccrualsAmount 8,500,000int_DerecognizedVendorLiabilityAccrualsAmount 11,200,000int_DerecognizedVendorLiabilityAccrualsAmount                                                                
Foreign Currency                                                                        
Net foreign currency transaction losses   1,000,000us-gaap_ForeignCurrencyTransactionLossBeforeTax 2,800,000us-gaap_ForeignCurrencyTransactionLossBeforeTax                                                                  
Net foreign currency transaction gain       100,000us-gaap_ForeignCurrencyTransactionGainBeforeTax                                                                
Net foreign currency translation adjustment losses   (30,896,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (13,189,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (9,606,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax                                                                
Cumulative foreign currency translation adjustment losses $ 60,100,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 60,100,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 29,300,000us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax