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

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- Definition Represents the impact of special tax concession on basic earnings per share. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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