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Commitments and Contingencies (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Commitments and Contingencies Disclosure [Abstract] |  |
Cash held for escrow and trust deposits | $ 24.2 | $ 27.5
Like-kind exchange deposits and reverse exchange property | $ 432.0 | $ 763.9

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- Definition Cash held for escrow and trust deposits + References No definition available. + Details
Name: | itic_Cashheldforescrowandtrustdeposits
Namespace Prefix: | itic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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