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Goodwill and Identifiable Intangible Assets (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Identifiable intangible assets
Gross Carrying Amount	$ 306,357,000us-gaap_FiniteLivedIntangibleAssetsGross	$ 241,662,000us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization	124,727,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	95,632,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net	181,630,000us-gaap_FiniteLivedIntangibleAssetsNet	146,030,000us-gaap_FiniteLivedIntangibleAssetsNet
Total intangible assets, Gross carrying value	338,318,000us-gaap_IntangibleAssetsGrossExcludingGoodwill	262,834,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
Total intangible assets, Net carrying value	213,591,000us-gaap_IntangibleAssetsNetExcludingGoodwill	167,202,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Intangible amortization expense	29,100,000us-gaap_AmortizationOfIntangibleAssets	22,400,000us-gaap_AmortizationOfIntangibleAssets	18,100,000us-gaap_AmortizationOfIntangibleAssets
Future estimated amortization of identifiable intangible assets
2015	28,770,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016	26,109,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017	22,456,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018	19,643,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019	16,271,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter	68,381,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Land Segment
Identifiable intangible assets
Total intangible assets, Net carrying value	139,253,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember	129,840,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Aviation Segment
Identifiable intangible assets
Total intangible assets, Net carrying value	67,142,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember	31,632,000us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Trademark/trade name rights
Identifiable intangible assets
Indefinite lived Intangible Assets	31,961,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = int_TrademarksAndTradeNamesRightsMember	21,172,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = int_TrademarksAndTradeNamesRightsMember
Customer relationships
Identifiable intangible assets
Gross Carrying Amount	238,959,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	188,276,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated Amortization	104,367,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	79,688,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Net	134,592,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	108,588,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Supplier agreements
Identifiable intangible assets
Gross Carrying Amount	33,648,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = int_SupplierAgreementsMember	33,648,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = int_SupplierAgreementsMember
Accumulated Amortization	9,052,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = int_SupplierAgreementsMember	7,310,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = int_SupplierAgreementsMember
Net	24,596,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = int_SupplierAgreementsMember	26,338,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = int_SupplierAgreementsMember
Other
Identifiable intangible assets
Gross Carrying Amount	33,750,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	19,738,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Accumulated Amortization	11,308,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	8,634,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Net	$ 22,442,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember	$ 11,104,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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