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Investments in Securities and Fair Value Schedule of Unrealized Losses on Investments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than Twelve Months, Fair Value | $ 13,914,809us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | $ 23,186,646us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Available-for-sale Securities, Less than 12 Months, Aggregate Losses | (176,003)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses | (570,605)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Available-for-sale Securities, Twelve Months or Longer, Fair Value | 1,323,670us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 244,929us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Available-for-sale Securities, 12 Months or Longer, Aggregate Losses | (69,611)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses | (36,086)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Available-for-sale Securities, Total Fair Value | 15,238,479us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 23,431,575us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Available-for-sale Securities, Total Aggregate Losses | (245,614)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses | (606,691)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
General obligations of U.S. states, territories and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than Twelve Months, Fair Value | 2,113,194us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 4,198,012us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Available-for-sale Securities, Less than 12 Months, Aggregate Losses | (19,542)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | (184,351)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Available-for-sale Securities, Twelve Months or Longer, Fair Value | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Available-for-sale Securities, 12 Months or Longer, Aggregate Losses | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Available-for-sale Securities, Total Fair Value | 2,113,194us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | 4,198,012us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Available-for-sale Securities, Total Aggregate Losses | (19,542)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember | (184,351)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_GeneralObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesMember
Issuer obligations of U.S. states, territories and political subdivisions special revenue |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than Twelve Months, Fair Value | 3,946,977us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 11,010,093us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Available-for-sale Securities, Less than 12 Months, Aggregate Losses | (13,453)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | (204,800)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Available-for-sale Securities, Twelve Months or Longer, Fair Value | 1,182,390us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Available-for-sale Securities, 12 Months or Longer, Aggregate Losses | (42,049)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Available-for-sale Securities, Total Fair Value | 5,129,367us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | 11,010,093us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Available-for-sale Securities, Total Aggregate Losses | (55,502)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember | (204,800)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = itic_IssuerObligationsUsStatesAndPoliticalSubdivisionsDebtSecuritiesSpecialRevenuesMember
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than Twelve Months, Fair Value | 6,924,430us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 5,942,570us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Less than 12 Months, Aggregate Losses | (71,339)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | (108,456)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Twelve Months or Longer, Fair Value | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, 12 Months or Longer, Aggregate Losses | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Total Fair Value | 6,924,430us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 5,942,570us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Available-for-sale Securities, Total Aggregate Losses | (71,339)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | (108,456)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than Twelve Months, Fair Value | 12,984,601us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember | 21,150,675us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember
Available-for-sale Securities, Less than 12 Months, Aggregate Losses | (104,334)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember | (497,607)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember
Available-for-sale Securities, Twelve Months or Longer, Fair Value | 1,182,390us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember
Available-for-sale Securities, 12 Months or Longer, Aggregate Losses | (42,049)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember | 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember
Available-for-sale Securities, Total Fair Value | 14,166,991us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember | 21,150,675us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember
Available-for-sale Securities, Total Aggregate Losses | (146,383)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember | (497,607)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Less than Twelve Months, Fair Value | 930,208us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 2,035,971us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Less than 12 Months, Aggregate Losses | (71,669)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (72,998)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Twelve Months or Longer, Fair Value | 141,280us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 244,929us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale Securities, 12 Months or Longer, Aggregate Losses | (27,562)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (36,086)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Total Fair Value | 1,071,488us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 2,280,900us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Available-for-sale Securities, Total Aggregate Losses | $ (99,231)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ (109,084)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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