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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract] |  |  |
Cash held for escrow and trust deposits | $ 18,032 | $ 20,510 |
Like-kind exchange deposits and reverse exchange property | $ 202,184 | $ 171,010 |
Net Premiums Written Percentage | 5.40% | 10.30% | 23.60%

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
- Definition The percentage of total net premiums written originated + References No definition available. + Details
Name: | itic_NetPremiumsWrittenPercentage
Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration