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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Statement of Cash Flows [Abstract] |  |
Non cash net unrealized (gain) loss on investments, deferred tax (provision) benefit | $ (1,429,681) | $ 950,040

X
- Definition The amount of deferred tax provision resulting from unrealized gains and losses during the period. + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration