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Fair Value Measurements (Details 2) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Balance, Beginning of Period, Assets (Liabilities)	$ (5,156)	$ (6,225)	$ (4,922)	$ (6,882)
Realized and Unrealized Gains Included in Earnings	149	252	5	755
Settlements			(90)	154
Balance, End of Period	(5,007)	(5,973)	(5,007)	(5,973)
Change in Unrealized Gains Relating to Instruments Still Held at end of Period	149	252	5	755
Commodity contracts
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Balance, Beginning of Period, Assets (Liabilities)			90	(2)
Settlements			(90)	2
Foreign currency contracts
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Balance, Beginning of Period, Assets (Liabilities)				(152)
Settlements				152
Earn-out
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Balance, Beginning of Period, Assets (Liabilities)	(5,156)	(6,225)	(5,012)	(6,728)
Realized and Unrealized Gains Included in Earnings	149	252	5	755
Balance, End of Period	(5,007)	(5,973)	(5,007)	(5,973)
Change in Unrealized Gains Relating to Instruments Still Held at end of Period	$ 149	$ 252	$ 5	$ 755

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- Details

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X

- Definition

Represents the settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ Details

Name:	int_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAndLiabilitySettlements
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X

- Definition

Represents the change in unrealized gains (losses) using significant unobservable inputs (level 3), relating to instruments held as of the balance sheet date.

+ Details

Name:	int_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesChangeInUnrealizedGainLosses
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X

- Definition

Represents assets and liabilities measured at fair value using significant unobservable inputs (level 3), which is required for the purpose of reconciliation of the beginning and ending balances.

+ Details

Name:	int_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsAndLiabilitiesValue
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Balance Type:	debit
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X

- Definition

This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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