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Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Land Segment |
Goodwill |
Decrease in goodwill due to foreign currency translation adjustments | $ 5.9 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Aviation Segment |
Goodwill |
Decrease in goodwill due to foreign currency translation adjustments | 2.6 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Marine segment |
Goodwill |
Decrease in goodwill due to foreign currency translation adjustments | 0.8 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
2014 Acquisitions | Land Segment |
Goodwill |
Increase (decrease) in goodwill | 1.0 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = int_Acquisitions2014Member / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
2014 Acquisitions | Aviation Segment |
Goodwill |
Increase (decrease) in goodwill | $ (1.9)us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = int_Acquisitions2014Member / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember

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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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