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Reserves for Claims Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Realized claim recoveries | $ 790,000itic_RealizedClaimRecoveries | $ 1,165,000itic_RealizedClaimRecoveries | $ 1,324,000itic_RealizedClaimRecoveries
Provision rate for title insurance claims | 4.80%itic_ProvisionRateforTitleInsuranceClaims | (0.50%)itic_ProvisionRateforTitleInsuranceClaims | 5.90%itic_ProvisionRateforTitleInsuranceClaims
Minimum |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Large claim threshold | $ 250,000itic_LargeClaimThreshold / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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- Definition Large Claim Threshold + References No definition available. + Details
Name: | itic_LargeClaimThreshold
Namespace Prefix: | itic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Provision rate for title insurance claims + References No definition available. + Details
Name: | itic_ProvisionRateforTitleInsuranceClaims
Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Realized claim recoveries + References No definition available. + Details
Name: | itic_RealizedClaimRecoveries
Namespace Prefix: | itic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |