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Investments in Securities and Fair Value Schedule of Assumptions Used to Determine Fair Value (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |  |
Cumulative probability of earning maximum rate until maturity | 0.00%itic_PercentageOfCumulativeProbabilityOfEarningMaximumRateUntilMaturity | 0.00%itic_PercentageOfCumulativeProbabilityOfEarningMaximumRateUntilMaturity
Cumulative probability of principle returned prior to maturity | 95.20%itic_PercentageOfCumulativeProbabilityOfPrincipleReturnedPriorToMaturity | 95.60%itic_PercentageOfCumulativeProbabilityOfPrincipleReturnedPriorToMaturity
Cumulative probability of default at some future point | 4.80%itic_PercentageOfCumulativeProbabilityOfDefaultAtSomeFuturePoint | 4.40%itic_PercentageOfCumulativeProbabilityOfDefaultAtSomeFuturePoint

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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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
Balance Type: | na
Period Type: | duration

X
- Details
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