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Fair Value Measurement Schedule Of Assumptions Used To Determine Fair Value (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Cumulative probability of earning maximum rate until maturity	0.00%	0.00%
Cumulative probability of principle returned prior to maturity	95.80%	96.10%
Cumulative probability of default at some future point	4.30%	3.90%

X

- Definition

Percentage of cumulative probability of default at some future point

+ References

No definition available.

+ Details

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X

- Definition

Percentage of cumulative probability of earning maximum rate until maturity

+ References

No definition available.

+ Details

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Namespace Prefix:	itic_
Data Type:	num:percentItemType
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X

- Definition

Percentage of cumulative probability of principle returned prior to maturity

+ References

No definition available.

+ Details

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Namespace Prefix:	itic_
Data Type:	num:percentItemType
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X

- Details

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