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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

X

- 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

X

- 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