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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, 2013 | $ 128,062,154 us-gaap_StockholdersEquity | $ 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 116,714,749 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 11,347,404 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, beginning of year, shares at Dec. 31, 2013 |  | 2,037,135 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income attributable to the Company | 986,438 us-gaap_NetIncomeLoss |  | 986,438 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends | (162,946)us-gaap_DividendsCommonStockCash |  | (162,946)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Shares of common stock repurchased and retired (in shares) |  | (500)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares of common stock repurchased and retired | (39,825)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (39,825)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock options and stock appreciation rights exercised (in shares) |  | 196 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options and stock appreciation rights exercised | (19)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross |  | (19)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation expense | 21,572 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 21,572 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Amortization related to postretirement health benefits | 366 itic_AmortizationRelatedToPostretirementHealthBenefits |  |  | 366 itic_AmortizationRelatedToPostretirementHealthBenefits / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net unrealized gain on investments | 3,101 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  | 3,101 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Income tax benefit from share-based compensation | 2,889 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 2,889 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, end of year at Mar. 31, 2014 | 128,873,730 us-gaap_StockholdersEquity | 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 117,522,858 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 11,350,871 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, end of year, shares at Mar. 31, 2014 |  | 2,036,831 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Balance, beginning of year at Dec. 31, 2014 | 137,563,706 us-gaap_StockholdersEquity | 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 124,707,196 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 12,856,509 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, beginning of year, shares at Dec. 31, 2014 |  | 2,023,270 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income attributable to the Company | 1,726,124 us-gaap_NetIncomeLoss |  | 1,726,124 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Dividends | (160,957)us-gaap_DividendsCommonStockCash |  | (160,957)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Shares of common stock repurchased and retired (in shares) |  | (15,036)us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Shares of common stock repurchased and retired | (1,069,185)us-gaap_TreasuryStockValueAcquiredCostMethod |  | (1,069,185)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Stock options and stock appreciation rights exercised (in shares) |  | 2,192 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock options and stock appreciation rights exercised | 54,988 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross |  | 54,988 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Share-based compensation expense | 32,600 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 32,600 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Amortization related to postretirement health benefits | 1,304 itic_AmortizationRelatedToPostretirementHealthBenefits |  |  | 1,304 itic_AmortizationRelatedToPostretirementHealthBenefits / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Net unrealized gain on investments | 178,433 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |  | 178,433 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Income tax benefit from share-based compensation | 26,875 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 26,875 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Balance, end of year at Mar. 31, 2015 | $ 138,353,888 us-gaap_StockholdersEquity | $ 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 125,317,641 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 13,036,246 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Balance, end of year, shares at Mar. 31, 2015 |  | 2,010,426 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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