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Commitments And Contingencies (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Like-kind exchange deposits and reverse exchange property	$ 247.9	$ 237.9

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- Definition

Like-kind exchange deposits and reverse exchange property

+ References

No definition available.

+ Details

Name:	itic_LikeKindExchangeDepositsAndReverseExchangeProperty
Namespace Prefix:	itic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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