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Earnings Per Common Share And Share Awards (Schedule Of Weighted Average Grant Date Fair Value Of Stock Awards Plans) (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Earnings Per Common Share And Stock Options [Abstract] |  |
Weighted-average market price | $ 50.50 | $ 41.50
Weighted-average grant-date fair value | $ 18.84 | $ 15.55

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Weighted-Average Market Price + References No definition available. + Details
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Namespace Prefix: | itic_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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