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Investments in Securities and Fair Value Schedule of Fair Value Assets Measured on Recurring Basis (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments $ 2,576,993us-gaap_ShortTermInvestments $ 7,926,373us-gaap_ShortTermInvestments
Available for sale securities, equity securities 39,254,981us-gaap_AvailableForSaleSecuritiesEquitySecurities 36,144,065us-gaap_AvailableForSaleSecuritiesEquitySecurities
Available-for-sale, fixed maturity 109,048,290us-gaap_AvailableForSaleSecuritiesDebtSecurities 91,445,413us-gaap_AvailableForSaleSecuritiesDebtSecurities
Total 150,880,264us-gaap_AssetsFairValueDisclosure 135,515,851us-gaap_AssetsFairValueDisclosure
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 2,576,993us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
7,926,373us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Total 41,831,974us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
44,070,438us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Total 108,109,190us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
90,509,713us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 0us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_ShortTermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Total 939,100us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
935,700us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Common stocks and nonredeemable preferred stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 39,254,981us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
36,144,065us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
Common stocks and nonredeemable preferred stock | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 39,254,981us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
36,144,065us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Common stocks and nonredeemable preferred stock | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 0us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Common stocks and nonredeemable preferred stock | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities, equity securities 0us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_AvailableForSaleSecuritiesEquitySecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= itic_CommonStockAndNonredeemablePreferredStockMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Obligations of U.S. states, territories and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 85,780,755us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
[1] 72,091,721us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
[1]
Obligations of U.S. states, territories and political subdivisions | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
[1] 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
[1]
Obligations of U.S. states, territories and political subdivisions | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 85,780,755us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1] 72,091,721us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[1]
Obligations of U.S. states, territories and political subdivisions | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1] 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1]
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 23,267,535us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
19,353,692us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
Corporate debt securities | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Corporate debt securities | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity 22,328,435us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
18,417,992us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Corporate debt securities | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale, fixed maturity $ 939,100us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 935,700us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[1] Denotes fair market value obtained from pricing services.