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Income Taxes (Details 3) (USD $)	0 Months Ended	12 Months Ended
	Jan. 01, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income taxes
Net operating loss carryforward		$ 4,819,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	$ 774,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Foreign net operating losses		19,900,000us-gaap_OperatingLossCarryforwards	2,600,000us-gaap_OperatingLossCarryforwards
Foreign tax credits		0us-gaap_TaxCreditCarryforwardAmount	0us-gaap_TaxCreditCarryforwardAmount
Annual capital in excess of par value pool of windfall income tax benefits related to employee compensation		1,000,000int_EstimatedWindfallTaxBenefitsRelatedToEmployeeCompensation	3,300,000int_EstimatedWindfallTaxBenefitsRelatedToEmployeeCompensation
Period applicable for additional special income tax concession	5 years
Decrease in foreign income taxes due to special income tax concession in Singapore		7,500,000int_IncomeTaxConcessionImpactOnForeignTaxes	6,200,000int_IncomeTaxConcessionImpactOnForeignTaxes	5,500,000int_IncomeTaxConcessionImpactOnForeignTaxes
Impact of income tax concession on basic earnings per common share (in dollars per share)		$ 0.11int_IncometaxConcessionImpactOnBasicEarningsPerShare	$ 0.09int_IncometaxConcessionImpactOnBasicEarningsPerShare	$ 0.08int_IncometaxConcessionImpactOnBasicEarningsPerShare
Impact of income tax concession on diluted earnings per common share (in dollars per share)		$ 0.1int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare	$ 0.09int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare	$ 0.08int_IncomeTaxConcessionImpactOnDilutedEarningsPerShare
December 31, 2016
Income taxes
Net operating loss carryforward		73,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / int_DeferredTaxAssetExpirationDateAxis = int_ExpirationOn31December2016Member
December 31, 2021
Income taxes
Net operating loss carryforward		124,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / int_DeferredTaxAssetExpirationDateAxis = int_ExpirationOn31December2021Member
December 31, 2023
Income taxes
Net operating loss carryforward		189,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / int_DeferredTaxAssetExpirationDateAxis = int_Expiration31December2023Member
December 31, 2024
Income taxes
Net operating loss carryforward		472,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / int_DeferredTaxAssetExpirationDateAxis = int_Expiration31December2024Member
Indefinite
Income taxes
Net operating loss carryforward		$ 3,961,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / int_DeferredTaxAssetExpirationDateAxis = int_IndefiniteMember

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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