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Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amount of property and equipment
Property and Equipment gross	$ 309,507,000us-gaap_PropertyPlantAndEquipmentGross	$ 214,022,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization	106,791,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	84,337,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net	202,716,000us-gaap_PropertyPlantAndEquipmentNet	129,685,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	30,300,000us-gaap_Depreciation	22,000,000us-gaap_Depreciation	18,600,000us-gaap_Depreciation
Land
Amount of property and equipment
Property and Equipment gross	17,333,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember	4,653,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Buildings and Leasehold improvements
Amount of property and equipment
Property and Equipment gross	43,356,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember	20,299,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember
Buildings and Leasehold improvements | Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Buildings and Leasehold improvements | Maximum
Amount of property and equipment
Estimated Useful Lives	40 years
Office equipment, furniture and fixtures
Amount of property and equipment
Property and Equipment gross	13,636,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = int_OfficeEquipmentFurnitureAndFixturesMember	8,629,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = int_OfficeEquipmentFurnitureAndFixturesMember
Office equipment, furniture and fixtures | Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Office equipment, furniture and fixtures | Maximum
Amount of property and equipment
Estimated Useful Lives	10 years
Computer equipment and software costs
Amount of property and equipment
Property and Equipment gross	102,713,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = int_ComputerEquipmentAndSoftwareCostsMember	88,077,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = int_ComputerEquipmentAndSoftwareCostsMember
Computer equipment and software costs | Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Computer equipment and software costs | Maximum
Amount of property and equipment
Estimated Useful Lives	10 years
Machinery, equipment and vehicles
Amount of property and equipment
Property and Equipment gross	132,469,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember	92,364,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Machinery, equipment and vehicles | Minimum
Amount of property and equipment
Estimated Useful Lives	3 years
Machinery, equipment and vehicles | Maximum
Amount of property and equipment
Estimated Useful Lives	40 years
Computer software costs
Computer software costs
Computer software costs	76,870,000us-gaap_CapitalizedComputerSoftwareGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	67,366,000us-gaap_CapitalizedComputerSoftwareGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Accumulated amortization	45,234,000us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	35,499,000us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Computer software costs, net	31,636,000us-gaap_CapitalizedComputerSoftwareNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	31,867,000us-gaap_CapitalizedComputerSoftwareNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Amortization expense related to computer software costs	9,800,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	7,800,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember	7,200,000us-gaap_CapitalizedComputerSoftwareAmortization / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Software development in progress
Computer software costs
Computer software costs	4,700,000us-gaap_CapitalizedComputerSoftwareGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = int_SoftwareDevelopmentInProgressMember	6,000,000us-gaap_CapitalizedComputerSoftwareGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = int_SoftwareDevelopmentInProgressMember
Capital leases
Amount of property and equipment
Property and Equipment gross	17,658,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember	5,268,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember
Accumulated depreciation and amortization	5,484,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember	1,869,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember
Property and equipment, net	$ 12,174,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember	$ 3,399,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldUnderCapitalLeasesMember

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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