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Investments in Securities and Fair Value Schedule of Earnings on Investments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | $ 4,259,501us-gaap_InvestmentIncomeNet | $ 3,894,608us-gaap_InvestmentIncomeNet | $ 3,980,411us-gaap_InvestmentIncomeNet
Fixed maturities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 3,282,810us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 2,997,901us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 3,154,131us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Equity securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 973,419us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 890,917us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 815,674us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Invested cash and other short-term investments |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 3,202us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CashAndCashEquivalentsMember | 5,754us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CashAndCashEquivalentsMember | 10,576us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CashAndCashEquivalentsMember
Miscellaneous interest |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | $ 70us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_MiscellaneousInterestMember | $ 36us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_MiscellaneousInterestMember | $ 30us-gaap_InvestmentIncomeNet / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_MiscellaneousInterestMember

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