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Consolidated Statements Of Cash Flows (Parenthetical) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Non cash net unrealized gain on investments, deferred tax provision	$ (1,353,729)	$ (1,004,593)

X

- Definition

The amount of deferred tax provision resulting from unrealized gains and losses during the period.

+ References

No definition available.

+ Details

Name:	itic_DeferredTaxProvisionRelatedToUnrealizedGainLossOnInvestments
Namespace Prefix:	itic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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