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Commitments and Contingencies (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Compensation Plans |  |  |
Liabilities under long-term service programs | $ 2.4 | $ 1.5 |
U.S. defined contribution plan |  |  |
401(k) defined contribution plan |  |  |
Employee contribution limit per calendar year (as a percent of compensation) | 60.00% |  |
Employer match for each 1% of the participants contributions up to 6% of the participants contributions (as a percent) | 50.00% | 50.00% | 50.00%
Percentage of eligible compensation up to 6% of the eligible compensation, matched 50% by employer | 1.00% | 1.00% | 1.00%
Employer contribution limit per calendar year (as a percent of compensation) | 6.00% | 6.00% | 6.00%
Expenses recognized for contributions | 1.6 | 1.5 | 1.2
Foreign defined contribution plans |  |  |
401(k) defined contribution plan |  |  |
Expenses recognized for contributions | $ 2.6 | $ 2.0 | $ 1.2

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- Definition The limit of annual employee contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
Name: | int_DefinedContributionPlanEmployeeContributionLimitPercentageOfCompensation
Namespace Prefix: | int_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The limit of annual employer contributions to the plan per calendar year as a percentage of compensation. + References No definition available. + Details
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Namespace Prefix: | int_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the employer matching contributions for the employees' contributions. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the first level of employee contributions (percentage of compensation) which are matched by the employer. + References No definition available. + Details
Name: | int_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
Namespace Prefix: | int_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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