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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Statement of Cash Flows [Abstract] |  |
Non cash net unrealized gain on investments, deferred tax provision | $ (985,156) | $ (1,429,681)

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