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Investments In Securities and Fair Value (Details)	3 Months Ended	12 Months Ended
	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

X

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration