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

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