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Goodwill and Identifiable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Goodwill and Identifiable Intangible Assets |  |
Impairment of goodwill and identifiable intangible assets not subject to amortization | $ 0 us-gaap_GoodwillAndIntangibleAssetImpairment | $ 0 us-gaap_GoodwillAndIntangibleAssetImpairment
Goodwill |  |
Balance at the beginning of the period | 483,591 us-gaap_Goodwill | 470,506 us-gaap_Goodwill
Acquisition of business | 180,683 us-gaap_GoodwillAcquiredDuringPeriod | 16,077 us-gaap_GoodwillAcquiredDuringPeriod
Adjustment of purchase price allocations | 411 us-gaap_GoodwillPurchaseAccountingAdjustments | (2,006)us-gaap_GoodwillPurchaseAccountingAdjustments
Foreign currency translation of non-USD functional currency subsidiary goodwill | (8,607)us-gaap_GoodwillTranslationAdjustments | (986)us-gaap_GoodwillTranslationAdjustments
Balance at the end of the period | 656,078 us-gaap_Goodwill | 483,591 us-gaap_Goodwill
Aviation Segment |  |
Goodwill |  |
Balance at the beginning of the period | 115,507 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 109,332 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Acquisition of business | 62,770 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember |
Adjustment of purchase price allocations |  | 6,500 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Foreign currency translation of non-USD functional currency subsidiary goodwill | (134)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | (325)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Balance at the end of the period | 178,143 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 115,507 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Marine segment |  |
Goodwill |  |
Balance at the beginning of the period | 69,088 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 69,931 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Acquisition of business | 4,660 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember |
Foreign currency translation of non-USD functional currency subsidiary goodwill | (680)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | (843)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Balance at the end of the period | 73,068 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 69,088 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Land Segment |  |
Goodwill |  |
Balance at the beginning of the period | 298,996 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 291,243 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Acquisition of business | 113,253 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 16,077 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Adjustment of purchase price allocations | 411 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | (8,506)us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Foreign currency translation of non-USD functional currency subsidiary goodwill | (7,793)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 182 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Balance at the end of the period | $ 404,867 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | $ 298,996 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember

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- Definition Amount after accumulated impairment loss 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 -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 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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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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