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Fair Value Measurement (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Auction rate security bond par value | $ 1,000,000 | $ 1,000,000
Percentage of auction rate security guaranteed | 97.00% | 97.00%
Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Percentage of carrying value of auction rate securities | 1.00% | 1.00%
Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Percentage of carrying value of auction rate securities | 4.00% | 4.00%

X
- Definition Auction rate security bond par value + References No definition available. + Details
Name: | itic_AuctionRateSecurityBondParValue
Namespace Prefix: | itic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage of auction rate security guaranteed + References No definition available. + Details
Name: | itic_PercentageOfAuctionRateSecurityGuaranteed
Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of carrying value of auction rate securities + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |