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

X

- 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

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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

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X

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