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Investments in Securities and Fair Value (Details) (USD $)
12 Months Ended
Dec. 31, 2014
security
Dec. 31, 2013
security
Dec. 31, 2012
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Available-for-sale, fixed maturity $ 109,048,290us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 91,445,413us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Available for sale securities, equity securities 39,254,981us-gaap_AvailableForSaleSecuritiesEquitySecurities 36,144,065us-gaap_AvailableForSaleSecuritiesEquitySecurities  
Number of securities with unrealized losses 25itic_NumberOfSecuritiesWithUnrealizedLosses 26itic_NumberOfSecuritiesWithUnrealizedLosses  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 14,542us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 93,436us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Fixed maturities      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Available-for-sale, fixed maturity 14,166,991us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
21,150,675us-gaap_AvailableForSaleSecuritiesDebtSecurities
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Available for sale securities, unrealized losses 146,383itic_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
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497,607itic_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
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Equity securities      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Available for sale securities, unrealized losses 99,231itic_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
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109,084itic_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments
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Available for sale securities, equity securities 1,071,488us-gaap_AvailableForSaleSecuritiesEquitySecurities
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2,280,900us-gaap_AvailableForSaleSecuritiesEquitySecurities
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Auction rate securities      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Difference in low to high range values as percent of carrying value 1.00%itic_DebtInstrumentDifferenceInLowToHighRangeValuesAsPercentageOfCarryingValue
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
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4.00%itic_DebtInstrumentDifferenceInLowToHighRangeValuesAsPercentageOfCarryingValue
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Level 3 | Auction rate securities      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Securities par value $ 1,000,000us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
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$ 1,000,000us-gaap_DebtInstrumentFaceAmount
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Percent of securities par value guaranteed by the U.S. Department of Education 97.00%itic_DebtInstrumentParValuePercentGuaranteed
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97.00%itic_DebtInstrumentParValuePercentGuaranteed
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