Fair Value Measurement (Schedule Of Assumptions Used To Determine Fair Value) (Details)	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurement [Abstract]
Cumulative probability of earning maximum rate until maturity	0.00%	0.00%
Cumulative probability of principle returned prior to maturity	96.00%	96.10%
Cumulative probability of default at some future point	4.00%	3.90%

Percentage of cumulative probability of principle returned prior to maturity

No definition available.

Name:	itic_PercentageOfCumulativeProbabilityOfPrincipleReturnedPriorToMaturity
Namespace Prefix:	itic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration