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Earnings Per Common Share and Share Awards Summary Of Share-Based Award Transactions (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, Options exercised | (1,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (2,650)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (6,380)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, Options exercised | $ 27.21us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 28.63us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 25.17us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |
StockOptionsAndStockAppreciationRightsSARS |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, Outstanding Beginning Balance | 19,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 98,150us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 101,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |
Number Of Shares, Options/SARs cancelled/forfeited/expired | 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | (70)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |
Number Of Shares, Outstanding Ending Balance | 21,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 19,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 98,150us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 101,600us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember
Number Of Shares, Exercisable as of December 31, 2014 | 19,875us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |  |  |
Number Of Shares, Unvested as of December 31, 2014 | 1,125itic_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedNumber / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, Outstanding Beginning Balance | $ 45.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 30.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 29.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |
Weighted Average Exercise Price, Options/SARs cancelled/forfeited/expired | $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 31.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |
Weighted Average Exercise Price, Outstanding Ending Balance | $ 51.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 45.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 30.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 29.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember
Weighted Average Exercise Price, Exercisable as of December 31, 2014 | $ 50.32us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |  |  |
Weighted Average Exercise Price, Unvested as of December 31, 2014 | $ 68.70itic_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |  |  |
Average Remaining Contractual Term, Outstanding Beginning Balance | 3 years 7 months 20 days | 3 years 5 months 4 days | 3 years 2 months 1 day | 3 years 10 months 27 days
Average Remaining Contractual Term, Outstanding Ending Balance | 3 years 7 months 20 days | 3 years 5 months 4 days | 3 years 2 months 1 day | 3 years 10 months 27 days
Average Remaining Contractual Term, Exercisable as of December 31, 2014 | 3 years 5 months 26 days |  |  |
Average Remaining Contractual Term, Unvested as of December 31, 2014 | 6 years 4 months 20 days |  |  |
Aggregate Intrinsic Value, Outstanding Beginning Balance | $ 669,610us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 2,871,710us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | $ 697,780us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |
Aggregate Intrinsic Value, Outstanding Ending Balance | 453,510us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 669,610us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 2,871,710us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember | 697,780us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember
Aggregate Intrinsic Value, Exercisable as of December 31, 2014 | 448,785us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |  |  |
Aggregate Intrinsic Value, Unvested as of December 31, 2014 | $ 4,725itic_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedIntrinsicValue / us-gaap_AwardTypeAxis = itic_StockOptionsAndStockAppreciationRightsSARSMember |  |  |
SARs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Number Of Shares, SARs granted | 4,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember | 3,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember | 3,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember |
Number Of Shares, Options exercised | (1,500)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember | (79,500)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Weighted Average Exercise Price, SARs granted | $ 68.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember | $ 71.59us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember | $ 50.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember |
Weighted Average Exercise Price, Options exercised | $ 49.04us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember | $ 28.77us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = itic_StockAppreciationRightsShareSettledSARSMember |  |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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