XML 61 R51.htm IDEA: XBRL DOCUMENT
v3.21.1

Commitments And Contingencies (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
Like-kind exchange deposits and reverse exchange property | $ 247.9 | $ 237.9

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