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

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