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Commitments and Contingencies (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Cash held for escrow and trust deposits	$ 31.6	$ 20.9
Like-kind exchange deposits and reverse exchange property	$ 308.7	$ 185.0

X

- Definition

Cash held for escrow and trust deposits

+ References

No definition available.

+ Details

Name:	itic_Cashheldforescrowandtrustdeposits
Namespace Prefix:	itic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

- References

No definition available.

+ Details

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