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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

X

- 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

X

- Definition

The limit of annual employer contributions to the plan per calendar year as a percentage of compensation.

+ References

No definition available.

+ Details

Name:	int_DefinedContributionPlanEmployerContributionLimitPercentageOfCompensation
Namespace Prefix:	int_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the employer matching contributions for the employees' contributions.

+ References

No definition available.

+ Details

Name:	int_DefinedContributionPlanEmployerMatch
Namespace Prefix:	int_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

Name:	int_DefinedContributionPlansLineItems
Namespace Prefix:	int_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DeferredCompensationArrangementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

Name:	us-gaap_DeferredCompensationCashbasedArrangementsLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration