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