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Consolidated Statements Of Stockholders' Equity (USD $) | Total | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income
--- | --- | --- | --- | ---
Balance, beginning of year at Dec. 31, 2011 | $ 106,512,184us-gaap_StockholdersEquity | $ 1us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 99,003,018us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 7,509,165us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, beginning of year, shares at Dec. 31, 2011 |  | 2,107,681us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income attributable to the Company | 11,102,496us-gaap_NetIncomeLoss |  | 11,102,496us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends | (603,334)us-gaap_DividendsCommonStockCash |  | (603,334)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Shares of common stock repurchased and retired (in shares) |  | (70,702)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares of common stock repurchased and retired | (3,975,532)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (3,975,532)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock options and stock appreciation rights exercised (in shares) |  | 6,380us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options and stock appreciation rights exercised | 160,557us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross |  | 160,557us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation expense | 74,553us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 74,553us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Amortization related to postretirement health benefits | 6,648itic_AmortizationRelatedToPostretirementHealthBenefits |  |  | 6,648itic_AmortizationRelatedToPostretirementHealthBenefits / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated postretirement benefit obligation adjustment | (54,726)itic_AccumulatedPostretirementBenefitObligationAdjustment |  |  | (54,726)itic_AccumulatedPostretirementBenefitObligationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net unrealized gain on investments | 1,393,943us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  | 1,393,943us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Temporary Equity, Interest Resulting From Subsidiary Purchase | 0itic_TemporaryEquityInterestResultingFromSubsidiaryPurchase |  |  |
Other | 22,101us-gaap_StockholdersEquityOther |  | 58,701us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (36,600)us-gaap_StockholdersEquityOther / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, end of year at Dec. 31, 2012 | 114,638,890us-gaap_StockholdersEquity | 1us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 105,820,459us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 8,818,430us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, end of year, shares at Dec. 31, 2012 |  | 2,043,359us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income attributable to the Company | 14,708,210us-gaap_NetIncomeLoss |  | 14,708,210us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends | (657,914)us-gaap_DividendsCommonStockCash |  | (657,914)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Shares of common stock repurchased and retired (in shares) |  | (56,223)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares of common stock repurchased and retired | (4,262,260)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (4,262,260)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock options and stock appreciation rights exercised (in shares) |  | 49,999us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options and stock appreciation rights exercised | 75,797us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross |  | 75,797us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation expense | 83,852us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 83,852us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Amortization related to postretirement health benefits | 3,140itic_AmortizationRelatedToPostretirementHealthBenefits |  |  | 3,140itic_AmortizationRelatedToPostretirementHealthBenefits / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated postretirement benefit obligation adjustment | 50,961itic_AccumulatedPostretirementBenefitObligationAdjustment |  |  | 50,961itic_AccumulatedPostretirementBenefitObligationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net unrealized gain on investments | 2,474,873us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  | 2,474,873us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Temporary Equity, Interest Resulting From Subsidiary Purchase | 0itic_TemporaryEquityInterestResultingFromSubsidiaryPurchase |  |  |
Income tax benefit from share-based compensation | 946,605us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 946,605us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, end of year at Dec. 31, 2013 | 128,062,154us-gaap_StockholdersEquity | 1us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 116,714,749us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 11,347,404us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, end of year, shares at Dec. 31, 2013 |  | 2,037,135us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income attributable to the Company | 9,648,975us-gaap_NetIncomeLoss |  | 9,648,975us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends | (650,433)us-gaap_DividendsCommonStockCash |  | (650,433)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Shares of common stock repurchased and retired (in shares) |  | (15,372)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares of common stock repurchased and retired | (1,055,765)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (1,055,765)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock options and stock appreciation rights exercised (in shares) |  | 1,507us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options and stock appreciation rights exercised | 27,100us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross |  | 27,100us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation expense | 120,891us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 120,891us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Amortization related to postretirement health benefits | 1,465itic_AmortizationRelatedToPostretirementHealthBenefits |  |  | 1,465itic_AmortizationRelatedToPostretirementHealthBenefits / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Accumulated postretirement benefit obligation adjustment | (31,100)itic_AccumulatedPostretirementBenefitObligationAdjustment |  |  | (31,100)itic_AccumulatedPostretirementBenefitObligationAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net unrealized gain on investments | 1,538,740us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  | 1,538,740us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Temporary Equity, Interest Resulting From Subsidiary Purchase | (114,320)itic_TemporaryEquityInterestResultingFromSubsidiaryPurchase |  | (114,320)itic_TemporaryEquityInterestResultingFromSubsidiaryPurchase / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Income tax benefit from share-based compensation | 15,999us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 15,999us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, end of year at Dec. 31, 2014 | $ 137,563,706us-gaap_StockholdersEquity | $ 1us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 124,707,196us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 12,856,509us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, end of year, shares at Dec. 31, 2014 |  | 2,023,270us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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