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Commitments And Contingencies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loss Contingencies [Line Items] |  |  |
Like-kind exchange deposits and reverse exchange property | $ 172,381,000 | $ 171,010,000 |
Independence Title [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Net Premiums Written Percentage | 5.50% | 10.30% | 23.60%

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- Definition Like-kind exchange deposits and reverse exchange property + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | xbrli:monetaryItemType
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- Definition The percentage of total net premiums written originated + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |