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Investments in Securities and Fair Value Schedule of Earnings on Investments (Details) (USD $)	12 Months Ended
	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

X

- Definition

Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(a),(b))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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