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Fair Value Disclosures (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Borrowings Fair Value Disclosure	$ 200.0

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- Definition

Borrowings, Fair Value Disclosure.

+ References

No definition available.

+ Details

Name:	it_BorrowingsFairValueDisclosure
Namespace Prefix:	it_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant