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v3.25.1

Investments In Securities and Fair Value (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2025 | Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |  |
OtherAssetsImpairedNumberOfAssets | 1 | 2

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- Definition Number of other assets impaired through earnings. + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration