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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments and Contingencies Disclosure [Abstract] |  |
Cash held for escrow and trust deposits | $ 18,674itic_Cashheldforescrowandtrustdeposits | $ 11,824itic_Cashheldforescrowandtrustdeposits
Like-kind exchange deposits and reverse exchange property | $ 82,477itic_LikeKindExchangeDepositsAndReverseExchangeProperty | $ 76,037itic_LikeKindExchangeDepositsAndReverseExchangeProperty

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