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Commitments and Contingencies (Details 2) (Stebbins Employment Agreement, USD $) In Millions, unless otherwise specified	1 Months Ended
	May 31, 2014	Jun. 30, 2014 Accrued expenses and other current liabilities	Jun. 30, 2014 Other long-term liabilities
Executive Non-Renewal Charge
Charges in connection with the non-renewal of agreement	$ 4.8
Non-cash expenses related to stock award compensation	1.1
Cash portion of the executive non-renewal charge	3.7
Unpaid amount of cash portion of the executive non-renewal charge		$ 0.8	$ 2.9

X

- Definition

Represents the amount of cash payments for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the unpaid amount of cash severance expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Represents the amount of non-cash expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	int_
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Balance Type:	debit
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X

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a severance arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	int_
Data Type:	xbrli:monetaryItemType
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X

- Details

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