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Commitments And Contingencies (Details) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Loss Contingencies [Line Items] |  |
Like-kind exchange deposits and reverse exchange property | $ 213,917,000 | $ 202,184,000

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration