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Business Segments, Geographic Information and Major Customers (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Accounts receivable, net: |  |  |
Accounts receivable, net | $ 2,307,852 us-gaap_AccountsReceivableNetCurrent | $ 2,538,642 us-gaap_AccountsReceivableNetCurrent |
Goodwill: |  |  |
Goodwill | 656,078 us-gaap_Goodwill | 483,591 us-gaap_Goodwill | 470,506 us-gaap_Goodwill
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 213,591 us-gaap_IntangibleAssetsNetExcludingGoodwill | 167,202 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Total assets: |  |  |
Total assets | 4,879,980 us-gaap_Assets | 4,739,277 us-gaap_Assets |
Aviation Segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 686,496 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 771,178 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember |
Allowance for bad debt | 7,864 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 9,351 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember |
Goodwill: |  |  |
Goodwill | 178,143 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 115,507 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 109,332 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 67,142 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 31,632 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember |
Marine segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 974,041 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 1,205,005 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember |
Allowance for bad debt | 8,434 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 9,845 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember |
Goodwill: |  |  |
Goodwill | 73,068 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 69,088 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 69,931 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 7,196 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 5,730 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember |
Land Segment |  |  |
Accounts receivable, net: |  |  |
Accounts receivable, net | 647,315 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 562,459 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember |
Allowance for bad debt | 9,394 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 9,992 us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember |
Goodwill: |  |  |
Goodwill | 404,867 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 298,996 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 291,243 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Identifiable intangible assets, net: |  |  |
Identifiable intangible assets, net | 139,253 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 129,840 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember |
Operating Segments | Aviation Segment |  |  |
Total assets: |  |  |
Total assets | 1,635,371 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 1,686,437 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember |
Operating Segments | Marine segment |  |  |
Total assets: |  |  |
Total assets | 1,483,077 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 1,536,817 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember |
Operating Segments | Land Segment |  |  |
Total assets: |  |  |
Total assets | 1,570,623 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 1,304,436 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember |
Corporate |  |  |
Total assets: |  |  |
Total assets | $ 190,909 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 211,587 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember |

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