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Investments in Securities and Fair Value Schedule of Gross Unrealized Gains and Losses and Amortized Cost for Securities (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Available-for-sale Securities [Abstract] |  |
Amortized Cost | $ 104,421,050us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 87,980,160us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains | 4,773,623itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments | 3,962,860itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Gross Unrealized Losses | 146,383itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments | 497,607itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Estimated Fair Value | 109,048,290us-gaap_AvailableForSaleSecurities | 91,445,413us-gaap_AvailableForSaleSecurities
Amortized Cost | 24,128,753us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis | 22,200,369us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
Gross Unrealized Gains | 15,225,459itic_AvailableForSaleEquitySecuritiesGrossUnrealizedGains | 14,052,780itic_AvailableForSaleEquitySecuritiesGrossUnrealizedGains
Gross Unrealized Losses | 99,231itic_AvailableForSaleEquitySecuritiesGrossUnrealizedLosses | 109,084itic_AvailableForSaleEquitySecuritiesGrossUnrealizedLosses
Estimated Fair Value | 39,254,981itic_AvailableForSaleEquitySecuritiesEstimatedFairValue | 36,144,065itic_AvailableForSaleEquitySecuritiesEstimatedFairValue
Short Term Investments Amortized Cost Basis | 2,576,993itic_ShortTermInvestmentsAmortizedCostBasis | 7,926,373itic_ShortTermInvestmentsAmortizedCostBasis
Short Term Investments Gross Unrealized Gains | 0itic_ShortTermInvestmentsGrossUnrealizedGains | 0itic_ShortTermInvestmentsGrossUnrealizedGains
Short Term Investments Gross Unrealized Losses | 0itic_ShortTermInvestmentsGrossUnrealizedLosses | 0itic_ShortTermInvestmentsGrossUnrealizedLosses
Short Term Investments Estimated Fair Value | 2,576,993itic_ShortTermInvestmentsEstimatedFairValue | 7,926,373itic_ShortTermInvestmentsEstimatedFairValue
General obligations of U.S. states, territories and political subdivisions |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 35,215,247us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 38,449,309us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Gross Unrealized Gains | 1,527,794itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 1,922,862itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Gross Unrealized Losses | 19,542itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 184,351itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Estimated Fair Value | 36,723,499us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 40,187,820us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Issuer obligations of U.S. states, territories and political subdivisions special revenue |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Number of Special Revenue Bonds | 30itic_NumberofSpecialRevenueBonds / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 46,707,033us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 30,874,571us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Gross Unrealized Gains | 2,405,725itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 1,234,130itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Gross Unrealized Losses | 55,502itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 204,800itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Estimated Fair Value | 49,057,256us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 31,903,901us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Corporate debt securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 21,576,641us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 17,736,608us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains | 823,133itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 789,840itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses | 71,339itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 108,456itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Estimated Fair Value | 22,328,435us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 18,417,992us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Auction rate securities |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 922,129us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 919,672us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Gross Unrealized Gains | 16,971itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 16,028itic_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Gross Unrealized Losses | 0itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 0itic_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Estimated Fair Value | 939,100us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember | 935,700us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_AuctionRateSecuritiesMember
Common stocks and nonredeemable preferred stocks |  |
Available-for-sale Securities [Abstract] |  |
Amortized Cost | 24,128,753us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | 22,200,369us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember
Gross Unrealized Gains | 15,225,459itic_AvailableForSaleEquitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | 14,052,780itic_AvailableForSaleEquitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember
Gross Unrealized Losses | 99,231itic_AvailableForSaleEquitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | 109,084itic_AvailableForSaleEquitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember
Estimated Fair Value | 39,254,981itic_AvailableForSaleEquitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember | 36,144,065itic_AvailableForSaleEquitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CommonStocksAndNonredeemablePreferredStocksMember
Money market funds and certificates of deposit |  |
Available-for-sale Securities [Abstract] |  |
Short Term Investments Amortized Cost Basis | 2,576,993itic_ShortTermInvestmentsAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember | 7,926,373itic_ShortTermInvestmentsAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember
Short Term Investments Gross Unrealized Gains | 0itic_ShortTermInvestmentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember | 0itic_ShortTermInvestmentsGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember
Short Term Investments Gross Unrealized Losses | 0itic_ShortTermInvestmentsGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember | 0itic_ShortTermInvestmentsGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember
Short Term Investments Estimated Fair Value | $ 2,576,993itic_ShortTermInvestmentsEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember | $ 7,926,373itic_ShortTermInvestmentsEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_CertificatesOfDepositAndOtherMember

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