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Business Segments, Geographic Information and Major Customers (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue: |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 9,779,555 us-gaap_Revenues | $ 11,713,463 us-gaap_Revenues | $ 11,342,475 us-gaap_Revenues | $ 10,550,896 us-gaap_Revenues | $ 10,404,653 us-gaap_Revenues | $ 10,493,661 us-gaap_Revenues | $ 10,479,604 us-gaap_Revenues | $ 10,184,029 us-gaap_Revenues | $ 43,386,389 us-gaap_Revenues | $ 41,561,947 us-gaap_Revenues | $ 38,945,338 us-gaap_Revenues
Gross profit: |  |  |  |  |  |  |  |  |  |  |
Gross profit | 219,466 us-gaap_GrossProfit | 214,608 us-gaap_GrossProfit | 191,516 us-gaap_GrossProfit | 188,032 us-gaap_GrossProfit | 195,580 us-gaap_GrossProfit | 186,341 us-gaap_GrossProfit | 188,458 us-gaap_GrossProfit | 182,379 us-gaap_GrossProfit | 813,622 us-gaap_GrossProfit | 752,758 us-gaap_GrossProfit | 673,447 us-gaap_GrossProfit
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 269,148 us-gaap_OperatingIncomeLoss | 264,358 us-gaap_OperatingIncomeLoss | 257,023 us-gaap_OperatingIncomeLoss
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 59,399 us-gaap_DepreciationAndAmortization | 44,710 us-gaap_DepreciationAndAmortization | 36,714 us-gaap_DepreciationAndAmortization
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 51,781 int_CapitalExpenditures | 82,716 int_CapitalExpenditures | 28,454 int_CapitalExpenditures
Aviation Segment |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 17,268,834 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 16,087,611 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 14,692,042 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Gross profit: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 321,596 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 327,178 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 294,601 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Marine segment |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 13,843,307 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 14,790,342 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 14,750,425 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Gross profit: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 205,612 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 177,052 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 208,028 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Land Segment |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 12,274,248 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 10,683,994 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 9,502,871 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Gross profit: |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 286,414 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 248,528 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 170,818 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 322,667 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 309,423 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 306,673 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments | Aviation Segment |  |  |  |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 142,303 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 150,886 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 128,153 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 15,419 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 15,854 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 17,381 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 9,017 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 5,737 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember | 4,713 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_AviationSegmentMember
Operating Segments | Marine segment |  |  |  |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 90,029 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 73,770 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 103,229 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 5,559 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 5,362 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 5,387 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 13,854 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 17,326 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember | 8,981 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_MarineSegmentMember
Operating Segments | Land Segment |  |  |  |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 90,335 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 84,767 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 75,291 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 34,684 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 20,861 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 10,406 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | 15,962 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 54,360 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember | 7,243 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = int_LandSegmentMember
Corporate |  |  |  |  |  |  |  |  |  |  |
Income from operations: |  |  |  |  |  |  |  |  |  |  |
Income from operations |  |  |  |  |  |  |  |  | 53,519 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 45,065 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 49,650 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Depreciation and amortization: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,737 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 2,633 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 3,540 us-gaap_DepreciationAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |
Total capital expenditures |  |  |  |  |  |  |  |  | $ 12,948 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 5,293 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 7,517 int_CapitalExpenditures / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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